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News Alerts | Climate threat worse than earlier feared </title>
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The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns..."/>
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The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns..." />
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<h1 class="cat-box-title">Climate threat worse than earlier feared</h1>
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<p align="justify"><br /><font >The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns that sea levels could rise by up to two metres by 2100 and five to ten times that over following centuries. (See salient features and links below)</font></p><p align="justify"><font >It says that the losses from glaciers, ice-sheets and the Polar Regions appear to be happening faster than anticipated, with the Greenland ice sheet, for example, recently seeing melting some 60 percent higher than the previous record of 1998. The report warns that the pace and extent of climate change may exceed even the most sobering expectations voiced by the scientific experts of the Intergovernmental Panel of Climate Change(IPCC) in their 2007 Fourth Assessment Report.<br /> <br />The UNEP report is a presentation of scientific findings, interpretations, ideas, and conclusions based on about 400 major scientific contributions to the understanding of Earth Systems and climate. It also emphasizes that the pace and scale of climate change may be coming faster and sooner than previously predicted. <br /></font></p><p align="justify"><font >The Compendium, compiled in collaboration with scientists around the world, offers sobering findings that underscore the need to Seal the Deal in the Climate Negotiations in Copenhagen, Denmark. The Compendium also came just as the Group of 20 (G20) leaders gathered for a two-day summit in Pittsburgh, Pennsylvania hosted by US President Barak Obama, where climate change figured prominently on the agenda. The Compendium is based on the findings of more than 400 major peer-reviewed scientific studies and research institutions over the last three years. </font></p><p align="justify"><font >Researchers have become increasingly concerned about ocean acidification linked with the absorption of carbon dioxide in seawater and the impact on shellfish and coral reefs. Water that can corrode a shell-making substance called aragonite is already welling up along the California coast decades earlier than existing models predict. </font></p><p align="justify"><font >There is also growing concern among some scientists that thresholds or tipping points may now be reached in a matter of years or a few decades including dramatic changes to the Indian sub-continent's monsoon, the Sahara and West Africa monsoons, and climate systems affecting a critical ecosystem like the Amazon rainforest. </font></p><p align="justify"><font >The report also underlines concern by scientists that the planet is now committed to some damaging and irreversible impacts as a result of the greenhouse gases already in the atmosphere. Losses of tropical and temperate mountain glaciers affecting perhaps 20 percent to 25 percent of the human population in terms of drinking water, irrigation and hydro-power. </font></p><p align="justify"><font >Shifts in the hydrological cycle resulting in the disappearance of regional climates with related losses of ecosystems, species and the spread of drylands northwards and southwards away from the equator. Recent science suggests that it may still be possible to avoid the most catastrophic impacts of climate change. However, this will only happen if there is immediate, cohesive and decisive action to both cut emissions and assist vulnerable countries adapt. </font></p><p align="justify"><font >The research findings and observations in the Compendium are divided into five categories: Earth Systems, Ice, Oceans, Ecosystems and Management. Key developments documented since the IPCC Fourth Assessment Report include: </font></p><p align="justify"><font ><em>Earth Systems </em></font></p><p align="justify"><font >• A new climate modeling system, forecasting average temperatures over a decade by combining natural variation with the impacts of human-induced climate change, projects that at least half of the 10 years following 2009 will exceed the warmest year currently on record. This is despite the fact that natural variation will partially offset the warming "signal" from greenhouse gas emissions. </font></p><p align="justify"><font >• The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. Global emissions were growing by 1.1 percent each year from 1990-1999 and this accelerated to 3.5 percent per year from 2000-2007. </font></p><p align="justify"><font >• The developing and least-developed economies, 80 percent of the world's population, accounted for 73 percent of the global growth of emissions in 2004. However, they contributed only 41 percent of total emissions, and just 23 percent of cumulative emissions since 1750. </font></p><p align="justify"><font >• Growth of the global economy in the early 2000s and an increase in its carbon intensity (emissions per unit of growth), combined with a decrease in the capacity of ecosystems on land and the oceans to act as carbon "sinks", have led to a rapid increase in the concentrations of carbon dioxide in the atmosphere. This has contributed to sooner-than-expected impacts including faster sea-level rise, ocean acidification, melting Arctic sea ice, warming of polar land masses, freshening of ocean currents and shifts in the circulation patterns of the oceans and atmosphere. </font></p><p align="justify"><font >• The observed increase in greenhouse gas concentrations are raising concern among some scientists that warming of between 1.4 and 4.3 degrees Centigrade above pre-industrial surface temperatures could occur. This exceeds the range of between 1 and 3 degrees perceived as the threshold for many "tipping points", including the end of summer Arctic sea ice, and the eventual melting of Himalayan glaciers and the Greenland ice sheet. </font></p><p align="justify"><font ><em>Ice </em></font></p><p align="justify"><font >• The melting of mountain glaciers appears to be accelerating, threatening the livelihoods of one fifth or more of the population who depend on glacier ice and seasonal snow for their water supply. For 30 reference glaciers in nine mountain ranges tracked by the World Glacier Monitoring Service, the mean rate of loss since 2000 has roughly doubled since the rate during the previous two decades. Current trends suggest that most glaciers will disappear from the Pyrenees by 2050 and from the mountains of tropical Africa by 2030. </font></p><p align="justify"><font >• In 2007, summer sea ice in the Arctic Ocean shrank to its smallest extent ever, 24 percent less than the previous record in 2005, and 34 percent less than the average minimum extent in the period 1970-2000. In 2008, the minimum ice extent was 9 percent greater than in 2007, but still the second lowest on record. </font></p><p align="justify"><font >• Until the summer of 2007, most models projected an ice-free September for the Arctic Ocean towards the end of the current century. Reconsideration based on current trends has led to speculation that this could occur as soon as 2030. </font></p><p align="justify"><font >• Melting of the Greenland Ice Sheet surface also seems to be accelerating. In the summer of 2007, the rate of melting was some 60 percent higher than the previous record in 1998. </font></p><p align="justify"><font >• The loss of ice from West Antarctica is estimated to have increased by 60 per cent in the decade to 2006, and by 140 percent from the Antarctic Peninsula in the same period. </font></p><p align="justify"><font >• Recent findings show that warming extends well to the south of the Antarctic Peninsula, to cover most of West Antarctica, an area of warming much larger than previously reported. </font></p><p align="justify"><font >• The hole in the ozone layer has had a cooling effect on Antarctica, and is partly responsible for masking expected warming on the continent. Recovery of stratospheric ozone, thanks to the phasing out of ozone-depleting substances, is projected to increase Antarctic temperatures in coming decades. </font></p><p align="justify"><font ><em>Oceans </em></font></p><p align="justify"><font >• Recent estimates of the combined impact of melting land-ice and thermal expansion of the oceans suggest a plausible average sea level rise of between 0.8 and 2.0 metres above the 1990 level by 2100. This compares with a projected rise of between 18 and 59 centimetres in the last IPCC report, which did not include an estimate of large-scale changes in ice-melt rates, due to lack of consensus. </font></p><p align="justify"><font >• Oceans are becoming more acidic more quickly than expected, jeopardizing the ability of shellfish and corals to form their external skeletons. Water that can corrode a shell-making carbonate substance called aragonite is already welling up during the summer along the California coast, decades earlier than models predict. </font></p><p align="justify"><font ><em>Ecosystems </em></font></p><p align="justify"><font >• Since the 2007 IPCC report, wide-ranging surveys have shown changes to the seasonal behaviour and distribution of all well-studied marine, freshwater and terrestrial groups of plants and animals. Polar and mountaintop species have seen severe contractions of their ranges. </font></p><p align="justify"><font >• A recent study projecting the impacts of climate change on the pattern of marine biodiversity suggests dramatic changes to come. Ecosystems in sub-polar waters, the tropics and semi-enclosed seas are predicted to suffer numerous extinctions by 2050, while the Arctic and Southern Oceans will experience severe species invasions. Marine ecosystems as a whole may see a species turnover of up to 60 percent. </font></p><p align="justify"><font >• Under the IPCC scenario that most closely matches current trends i.e. with the highest projected emissions - between 12 and 39 percent of the Earth's land surface could experience previously unknown climate conditions by 2100. A similar proportion, between 10 and 48 percent, will see existing climates disappear. Many of these "disappearing climates" coincide with biodiversity hotspots, and with the added problem of fragmented habitats and physical obstructions to migration, it is feared many species will struggle to adapt to the new conditions. </font></p><p align="justify"><font >• Perennial drought conditions have already been observed in South-eastern Australia and South-western North America. Projections suggest that persistent water scarcity will increase in a number of regions in coming years, including southern and northern Africa, the Mediterranean, much of the Middle East, a broad band in Central Asia and the Indian subcontinent. </font></p><p align="justify"><font ><em>Management </em></font></p><p align="justify"><font >• The reality of a rapidly-changing climate may make conventional approaches to conservation and restoration of habitats ineffective. Drastic measures such as large-scale translocation or assisted colonization of species may need to be considered. </font></p><p align="justify"><font >• Eco-agriculture, in which landscapes are managed to sustain a range of ecosystem services, including food production, may need to replace the current segregation of land use between conservation and production. This could help create resilient agricultural ecosystems better able to adapt to the changing climate conditions. </font></p><p align="justify"><font >• Experts increasingly agree that active protection of tropical forests is a cost-effective means of cutting global emissions. An international mechanism of reducing emissions from deforestation and forest degradation (REDD) is likely to emerge as a central component of a new agreement in Copenhagen. However, many issues need to be resolved, such as how to verify the reductions and ensuring fair treatment of local and indigenous forest communities. </font></p><p align="justify"><font >• A number of innovative approaches are emerging to keep carbon out of the atmosphere, including the use of "biochar", biologically-derived charcoal. It is mixed in soils, increasing fertility and potentially locking up carbon for centuries. This is a 21st century application of a technology known as Terra Preta, or Black Earth, used by Amazon peoples before the arrival of Europeans in South America. </font></p><p align="justify"><br /><font ><em><strong>Further readings:</strong></em></font></p><p align="justify"><a href="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf" title="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf">http://www.unep.org/pdf/ccScienceCompendium2009/cc_Science<br />Compendium2009_full_en.pdf</a><font > </font></p><p align="justify"><a href="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/" title="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/">http://www.climatesciencewatch.org/index.php/csw/details/u<br />nep-climate-change-science-compendium/</a><font > </font></p><p align="justify"><a href="http://www.uia.be/node/319023" title="http://www.uia.be/node/319023">http://www.uia.be/node/319023</a><font > </font></p><p align="justify"><a href="http://www.unep.org/compendium2009/" title="http://www.unep.org/compendium2009/">http://www.unep.org/compendium2009/</a><font > </font></p><p align="justify"><a href="http://www.sealthedeal2009.org/" title="http://www.sealthedeal2009.org/">http://www.sealthedeal2009.org/</a><font > </font></p><font ><p align="justify"> </p><font face="arial,helvetica,sans-serif"></font></font>
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<h1 class="cat-box-title">Climate threat worse than earlier feared</h1>
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Published on</span><span class="text-date"> Dec 2, 2009</span>
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<p align="justify"><br /><font >The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns that sea levels could rise by up to two metres by 2100 and five to ten times that over following centuries. (See salient features and links below)</font></p><p align="justify"><font >It says that the losses from glaciers, ice-sheets and the Polar Regions appear to be happening faster than anticipated, with the Greenland ice sheet, for example, recently seeing melting some 60 percent higher than the previous record of 1998. The report warns that the pace and extent of climate change may exceed even the most sobering expectations voiced by the scientific experts of the Intergovernmental Panel of Climate Change(IPCC) in their 2007 Fourth Assessment Report.<br /> <br />The UNEP report is a presentation of scientific findings, interpretations, ideas, and conclusions based on about 400 major scientific contributions to the understanding of Earth Systems and climate. It also emphasizes that the pace and scale of climate change may be coming faster and sooner than previously predicted. <br /></font></p><p align="justify"><font >The Compendium, compiled in collaboration with scientists around the world, offers sobering findings that underscore the need to Seal the Deal in the Climate Negotiations in Copenhagen, Denmark. The Compendium also came just as the Group of 20 (G20) leaders gathered for a two-day summit in Pittsburgh, Pennsylvania hosted by US President Barak Obama, where climate change figured prominently on the agenda. The Compendium is based on the findings of more than 400 major peer-reviewed scientific studies and research institutions over the last three years. </font></p><p align="justify"><font >Researchers have become increasingly concerned about ocean acidification linked with the absorption of carbon dioxide in seawater and the impact on shellfish and coral reefs. Water that can corrode a shell-making substance called aragonite is already welling up along the California coast decades earlier than existing models predict. </font></p><p align="justify"><font >There is also growing concern among some scientists that thresholds or tipping points may now be reached in a matter of years or a few decades including dramatic changes to the Indian sub-continent's monsoon, the Sahara and West Africa monsoons, and climate systems affecting a critical ecosystem like the Amazon rainforest. </font></p><p align="justify"><font >The report also underlines concern by scientists that the planet is now committed to some damaging and irreversible impacts as a result of the greenhouse gases already in the atmosphere. Losses of tropical and temperate mountain glaciers affecting perhaps 20 percent to 25 percent of the human population in terms of drinking water, irrigation and hydro-power. </font></p><p align="justify"><font >Shifts in the hydrological cycle resulting in the disappearance of regional climates with related losses of ecosystems, species and the spread of drylands northwards and southwards away from the equator. Recent science suggests that it may still be possible to avoid the most catastrophic impacts of climate change. However, this will only happen if there is immediate, cohesive and decisive action to both cut emissions and assist vulnerable countries adapt. </font></p><p align="justify"><font >The research findings and observations in the Compendium are divided into five categories: Earth Systems, Ice, Oceans, Ecosystems and Management. Key developments documented since the IPCC Fourth Assessment Report include: </font></p><p align="justify"><font ><em>Earth Systems </em></font></p><p align="justify"><font >• A new climate modeling system, forecasting average temperatures over a decade by combining natural variation with the impacts of human-induced climate change, projects that at least half of the 10 years following 2009 will exceed the warmest year currently on record. This is despite the fact that natural variation will partially offset the warming "signal" from greenhouse gas emissions. </font></p><p align="justify"><font >• The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. Global emissions were growing by 1.1 percent each year from 1990-1999 and this accelerated to 3.5 percent per year from 2000-2007. </font></p><p align="justify"><font >• The developing and least-developed economies, 80 percent of the world's population, accounted for 73 percent of the global growth of emissions in 2004. However, they contributed only 41 percent of total emissions, and just 23 percent of cumulative emissions since 1750. </font></p><p align="justify"><font >• Growth of the global economy in the early 2000s and an increase in its carbon intensity (emissions per unit of growth), combined with a decrease in the capacity of ecosystems on land and the oceans to act as carbon "sinks", have led to a rapid increase in the concentrations of carbon dioxide in the atmosphere. This has contributed to sooner-than-expected impacts including faster sea-level rise, ocean acidification, melting Arctic sea ice, warming of polar land masses, freshening of ocean currents and shifts in the circulation patterns of the oceans and atmosphere. </font></p><p align="justify"><font >• The observed increase in greenhouse gas concentrations are raising concern among some scientists that warming of between 1.4 and 4.3 degrees Centigrade above pre-industrial surface temperatures could occur. This exceeds the range of between 1 and 3 degrees perceived as the threshold for many "tipping points", including the end of summer Arctic sea ice, and the eventual melting of Himalayan glaciers and the Greenland ice sheet. </font></p><p align="justify"><font ><em>Ice </em></font></p><p align="justify"><font >• The melting of mountain glaciers appears to be accelerating, threatening the livelihoods of one fifth or more of the population who depend on glacier ice and seasonal snow for their water supply. For 30 reference glaciers in nine mountain ranges tracked by the World Glacier Monitoring Service, the mean rate of loss since 2000 has roughly doubled since the rate during the previous two decades. Current trends suggest that most glaciers will disappear from the Pyrenees by 2050 and from the mountains of tropical Africa by 2030. </font></p><p align="justify"><font >• In 2007, summer sea ice in the Arctic Ocean shrank to its smallest extent ever, 24 percent less than the previous record in 2005, and 34 percent less than the average minimum extent in the period 1970-2000. In 2008, the minimum ice extent was 9 percent greater than in 2007, but still the second lowest on record. </font></p><p align="justify"><font >• Until the summer of 2007, most models projected an ice-free September for the Arctic Ocean towards the end of the current century. Reconsideration based on current trends has led to speculation that this could occur as soon as 2030. </font></p><p align="justify"><font >• Melting of the Greenland Ice Sheet surface also seems to be accelerating. In the summer of 2007, the rate of melting was some 60 percent higher than the previous record in 1998. </font></p><p align="justify"><font >• The loss of ice from West Antarctica is estimated to have increased by 60 per cent in the decade to 2006, and by 140 percent from the Antarctic Peninsula in the same period. </font></p><p align="justify"><font >• Recent findings show that warming extends well to the south of the Antarctic Peninsula, to cover most of West Antarctica, an area of warming much larger than previously reported. </font></p><p align="justify"><font >• The hole in the ozone layer has had a cooling effect on Antarctica, and is partly responsible for masking expected warming on the continent. Recovery of stratospheric ozone, thanks to the phasing out of ozone-depleting substances, is projected to increase Antarctic temperatures in coming decades. </font></p><p align="justify"><font ><em>Oceans </em></font></p><p align="justify"><font >• Recent estimates of the combined impact of melting land-ice and thermal expansion of the oceans suggest a plausible average sea level rise of between 0.8 and 2.0 metres above the 1990 level by 2100. This compares with a projected rise of between 18 and 59 centimetres in the last IPCC report, which did not include an estimate of large-scale changes in ice-melt rates, due to lack of consensus. </font></p><p align="justify"><font >• Oceans are becoming more acidic more quickly than expected, jeopardizing the ability of shellfish and corals to form their external skeletons. Water that can corrode a shell-making carbonate substance called aragonite is already welling up during the summer along the California coast, decades earlier than models predict. </font></p><p align="justify"><font ><em>Ecosystems </em></font></p><p align="justify"><font >• Since the 2007 IPCC report, wide-ranging surveys have shown changes to the seasonal behaviour and distribution of all well-studied marine, freshwater and terrestrial groups of plants and animals. Polar and mountaintop species have seen severe contractions of their ranges. </font></p><p align="justify"><font >• A recent study projecting the impacts of climate change on the pattern of marine biodiversity suggests dramatic changes to come. Ecosystems in sub-polar waters, the tropics and semi-enclosed seas are predicted to suffer numerous extinctions by 2050, while the Arctic and Southern Oceans will experience severe species invasions. Marine ecosystems as a whole may see a species turnover of up to 60 percent. </font></p><p align="justify"><font >• Under the IPCC scenario that most closely matches current trends i.e. with the highest projected emissions - between 12 and 39 percent of the Earth's land surface could experience previously unknown climate conditions by 2100. A similar proportion, between 10 and 48 percent, will see existing climates disappear. Many of these "disappearing climates" coincide with biodiversity hotspots, and with the added problem of fragmented habitats and physical obstructions to migration, it is feared many species will struggle to adapt to the new conditions. </font></p><p align="justify"><font >• Perennial drought conditions have already been observed in South-eastern Australia and South-western North America. Projections suggest that persistent water scarcity will increase in a number of regions in coming years, including southern and northern Africa, the Mediterranean, much of the Middle East, a broad band in Central Asia and the Indian subcontinent. </font></p><p align="justify"><font ><em>Management </em></font></p><p align="justify"><font >• The reality of a rapidly-changing climate may make conventional approaches to conservation and restoration of habitats ineffective. Drastic measures such as large-scale translocation or assisted colonization of species may need to be considered. </font></p><p align="justify"><font >• Eco-agriculture, in which landscapes are managed to sustain a range of ecosystem services, including food production, may need to replace the current segregation of land use between conservation and production. This could help create resilient agricultural ecosystems better able to adapt to the changing climate conditions. </font></p><p align="justify"><font >• Experts increasingly agree that active protection of tropical forests is a cost-effective means of cutting global emissions. An international mechanism of reducing emissions from deforestation and forest degradation (REDD) is likely to emerge as a central component of a new agreement in Copenhagen. However, many issues need to be resolved, such as how to verify the reductions and ensuring fair treatment of local and indigenous forest communities. </font></p><p align="justify"><font >• A number of innovative approaches are emerging to keep carbon out of the atmosphere, including the use of "biochar", biologically-derived charcoal. It is mixed in soils, increasing fertility and potentially locking up carbon for centuries. This is a 21st century application of a technology known as Terra Preta, or Black Earth, used by Amazon peoples before the arrival of Europeans in South America. </font></p><p align="justify"><br /><font ><em><strong>Further readings:</strong></em></font></p><p align="justify"><a href="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf" title="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf">http://www.unep.org/pdf/ccScienceCompendium2009/cc_Science<br />Compendium2009_full_en.pdf</a><font > </font></p><p align="justify"><a href="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/" title="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/">http://www.climatesciencewatch.org/index.php/csw/details/u<br />nep-climate-change-science-compendium/</a><font > </font></p><p align="justify"><a href="http://www.uia.be/node/319023" title="http://www.uia.be/node/319023">http://www.uia.be/node/319023</a><font > </font></p><p align="justify"><a href="http://www.unep.org/compendium2009/" title="http://www.unep.org/compendium2009/">http://www.unep.org/compendium2009/</a><font > </font></p><p align="justify"><a href="http://www.sealthedeal2009.org/" title="http://www.sealthedeal2009.org/">http://www.sealthedeal2009.org/</a><font > </font></p><font ><p align="justify"> </p><font face="arial,helvetica,sans-serif"></font></font>
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News Alerts | Climate threat worse than earlier feared </title>
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<h1 class="cat-box-title">Climate threat worse than earlier feared</h1>
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<p align="justify"><br /><font >The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns that sea levels could rise by up to two metres by 2100 and five to ten times that over following centuries. (See salient features and links below)</font></p><p align="justify"><font >It says that the losses from glaciers, ice-sheets and the Polar Regions appear to be happening faster than anticipated, with the Greenland ice sheet, for example, recently seeing melting some 60 percent higher than the previous record of 1998. The report warns that the pace and extent of climate change may exceed even the most sobering expectations voiced by the scientific experts of the Intergovernmental Panel of Climate Change(IPCC) in their 2007 Fourth Assessment Report.<br /> <br />The UNEP report is a presentation of scientific findings, interpretations, ideas, and conclusions based on about 400 major scientific contributions to the understanding of Earth Systems and climate. It also emphasizes that the pace and scale of climate change may be coming faster and sooner than previously predicted. <br /></font></p><p align="justify"><font >The Compendium, compiled in collaboration with scientists around the world, offers sobering findings that underscore the need to Seal the Deal in the Climate Negotiations in Copenhagen, Denmark. The Compendium also came just as the Group of 20 (G20) leaders gathered for a two-day summit in Pittsburgh, Pennsylvania hosted by US President Barak Obama, where climate change figured prominently on the agenda. The Compendium is based on the findings of more than 400 major peer-reviewed scientific studies and research institutions over the last three years. </font></p><p align="justify"><font >Researchers have become increasingly concerned about ocean acidification linked with the absorption of carbon dioxide in seawater and the impact on shellfish and coral reefs. Water that can corrode a shell-making substance called aragonite is already welling up along the California coast decades earlier than existing models predict. </font></p><p align="justify"><font >There is also growing concern among some scientists that thresholds or tipping points may now be reached in a matter of years or a few decades including dramatic changes to the Indian sub-continent's monsoon, the Sahara and West Africa monsoons, and climate systems affecting a critical ecosystem like the Amazon rainforest. </font></p><p align="justify"><font >The report also underlines concern by scientists that the planet is now committed to some damaging and irreversible impacts as a result of the greenhouse gases already in the atmosphere. Losses of tropical and temperate mountain glaciers affecting perhaps 20 percent to 25 percent of the human population in terms of drinking water, irrigation and hydro-power. </font></p><p align="justify"><font >Shifts in the hydrological cycle resulting in the disappearance of regional climates with related losses of ecosystems, species and the spread of drylands northwards and southwards away from the equator. Recent science suggests that it may still be possible to avoid the most catastrophic impacts of climate change. However, this will only happen if there is immediate, cohesive and decisive action to both cut emissions and assist vulnerable countries adapt. </font></p><p align="justify"><font >The research findings and observations in the Compendium are divided into five categories: Earth Systems, Ice, Oceans, Ecosystems and Management. Key developments documented since the IPCC Fourth Assessment Report include: </font></p><p align="justify"><font ><em>Earth Systems </em></font></p><p align="justify"><font >• A new climate modeling system, forecasting average temperatures over a decade by combining natural variation with the impacts of human-induced climate change, projects that at least half of the 10 years following 2009 will exceed the warmest year currently on record. This is despite the fact that natural variation will partially offset the warming "signal" from greenhouse gas emissions. </font></p><p align="justify"><font >• The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. Global emissions were growing by 1.1 percent each year from 1990-1999 and this accelerated to 3.5 percent per year from 2000-2007. </font></p><p align="justify"><font >• The developing and least-developed economies, 80 percent of the world's population, accounted for 73 percent of the global growth of emissions in 2004. However, they contributed only 41 percent of total emissions, and just 23 percent of cumulative emissions since 1750. </font></p><p align="justify"><font >• Growth of the global economy in the early 2000s and an increase in its carbon intensity (emissions per unit of growth), combined with a decrease in the capacity of ecosystems on land and the oceans to act as carbon "sinks", have led to a rapid increase in the concentrations of carbon dioxide in the atmosphere. This has contributed to sooner-than-expected impacts including faster sea-level rise, ocean acidification, melting Arctic sea ice, warming of polar land masses, freshening of ocean currents and shifts in the circulation patterns of the oceans and atmosphere. </font></p><p align="justify"><font >• The observed increase in greenhouse gas concentrations are raising concern among some scientists that warming of between 1.4 and 4.3 degrees Centigrade above pre-industrial surface temperatures could occur. This exceeds the range of between 1 and 3 degrees perceived as the threshold for many "tipping points", including the end of summer Arctic sea ice, and the eventual melting of Himalayan glaciers and the Greenland ice sheet. </font></p><p align="justify"><font ><em>Ice </em></font></p><p align="justify"><font >• The melting of mountain glaciers appears to be accelerating, threatening the livelihoods of one fifth or more of the population who depend on glacier ice and seasonal snow for their water supply. For 30 reference glaciers in nine mountain ranges tracked by the World Glacier Monitoring Service, the mean rate of loss since 2000 has roughly doubled since the rate during the previous two decades. Current trends suggest that most glaciers will disappear from the Pyrenees by 2050 and from the mountains of tropical Africa by 2030. </font></p><p align="justify"><font >• In 2007, summer sea ice in the Arctic Ocean shrank to its smallest extent ever, 24 percent less than the previous record in 2005, and 34 percent less than the average minimum extent in the period 1970-2000. In 2008, the minimum ice extent was 9 percent greater than in 2007, but still the second lowest on record. </font></p><p align="justify"><font >• Until the summer of 2007, most models projected an ice-free September for the Arctic Ocean towards the end of the current century. Reconsideration based on current trends has led to speculation that this could occur as soon as 2030. </font></p><p align="justify"><font >• Melting of the Greenland Ice Sheet surface also seems to be accelerating. In the summer of 2007, the rate of melting was some 60 percent higher than the previous record in 1998. </font></p><p align="justify"><font >• The loss of ice from West Antarctica is estimated to have increased by 60 per cent in the decade to 2006, and by 140 percent from the Antarctic Peninsula in the same period. </font></p><p align="justify"><font >• Recent findings show that warming extends well to the south of the Antarctic Peninsula, to cover most of West Antarctica, an area of warming much larger than previously reported. </font></p><p align="justify"><font >• The hole in the ozone layer has had a cooling effect on Antarctica, and is partly responsible for masking expected warming on the continent. Recovery of stratospheric ozone, thanks to the phasing out of ozone-depleting substances, is projected to increase Antarctic temperatures in coming decades. </font></p><p align="justify"><font ><em>Oceans </em></font></p><p align="justify"><font >• Recent estimates of the combined impact of melting land-ice and thermal expansion of the oceans suggest a plausible average sea level rise of between 0.8 and 2.0 metres above the 1990 level by 2100. This compares with a projected rise of between 18 and 59 centimetres in the last IPCC report, which did not include an estimate of large-scale changes in ice-melt rates, due to lack of consensus. </font></p><p align="justify"><font >• Oceans are becoming more acidic more quickly than expected, jeopardizing the ability of shellfish and corals to form their external skeletons. Water that can corrode a shell-making carbonate substance called aragonite is already welling up during the summer along the California coast, decades earlier than models predict. </font></p><p align="justify"><font ><em>Ecosystems </em></font></p><p align="justify"><font >• Since the 2007 IPCC report, wide-ranging surveys have shown changes to the seasonal behaviour and distribution of all well-studied marine, freshwater and terrestrial groups of plants and animals. Polar and mountaintop species have seen severe contractions of their ranges. </font></p><p align="justify"><font >• A recent study projecting the impacts of climate change on the pattern of marine biodiversity suggests dramatic changes to come. Ecosystems in sub-polar waters, the tropics and semi-enclosed seas are predicted to suffer numerous extinctions by 2050, while the Arctic and Southern Oceans will experience severe species invasions. Marine ecosystems as a whole may see a species turnover of up to 60 percent. </font></p><p align="justify"><font >• Under the IPCC scenario that most closely matches current trends i.e. with the highest projected emissions - between 12 and 39 percent of the Earth's land surface could experience previously unknown climate conditions by 2100. A similar proportion, between 10 and 48 percent, will see existing climates disappear. Many of these "disappearing climates" coincide with biodiversity hotspots, and with the added problem of fragmented habitats and physical obstructions to migration, it is feared many species will struggle to adapt to the new conditions. </font></p><p align="justify"><font >• Perennial drought conditions have already been observed in South-eastern Australia and South-western North America. Projections suggest that persistent water scarcity will increase in a number of regions in coming years, including southern and northern Africa, the Mediterranean, much of the Middle East, a broad band in Central Asia and the Indian subcontinent. </font></p><p align="justify"><font ><em>Management </em></font></p><p align="justify"><font >• The reality of a rapidly-changing climate may make conventional approaches to conservation and restoration of habitats ineffective. Drastic measures such as large-scale translocation or assisted colonization of species may need to be considered. </font></p><p align="justify"><font >• Eco-agriculture, in which landscapes are managed to sustain a range of ecosystem services, including food production, may need to replace the current segregation of land use between conservation and production. This could help create resilient agricultural ecosystems better able to adapt to the changing climate conditions. </font></p><p align="justify"><font >• Experts increasingly agree that active protection of tropical forests is a cost-effective means of cutting global emissions. An international mechanism of reducing emissions from deforestation and forest degradation (REDD) is likely to emerge as a central component of a new agreement in Copenhagen. However, many issues need to be resolved, such as how to verify the reductions and ensuring fair treatment of local and indigenous forest communities. </font></p><p align="justify"><font >• A number of innovative approaches are emerging to keep carbon out of the atmosphere, including the use of "biochar", biologically-derived charcoal. It is mixed in soils, increasing fertility and potentially locking up carbon for centuries. This is a 21st century application of a technology known as Terra Preta, or Black Earth, used by Amazon peoples before the arrival of Europeans in South America. </font></p><p align="justify"><br /><font ><em><strong>Further readings:</strong></em></font></p><p align="justify"><a href="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf" title="http://www.unep.org/pdf/ccScienceCompendium2009/cc_ScienceCompendium2009_full_en.pdf">http://www.unep.org/pdf/ccScienceCompendium2009/cc_Science<br />Compendium2009_full_en.pdf</a><font > </font></p><p align="justify"><a href="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/" title="http://www.climatesciencewatch.org/index.php/csw/details/unep-climate-change-science-compendium/">http://www.climatesciencewatch.org/index.php/csw/details/u<br />nep-climate-change-science-compendium/</a><font > </font></p><p align="justify"><a href="http://www.uia.be/node/319023" title="http://www.uia.be/node/319023">http://www.uia.be/node/319023</a><font > </font></p><p align="justify"><a href="http://www.unep.org/compendium2009/" title="http://www.unep.org/compendium2009/">http://www.unep.org/compendium2009/</a><font > </font></p><p align="justify"><a href="http://www.sealthedeal2009.org/" title="http://www.sealthedeal2009.org/">http://www.sealthedeal2009.org/</a><font > </font></p><font ><p align="justify"> </p><font face="arial,helvetica,sans-serif"></font></font>
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News Alerts | Climate threat worse than earlier feared
The latest UN environment report based on about 400 major peer-reviewed scientific studies over three years has warned that the threat of climate change could be much worse than predicted earlier. The UNEP Climate Change Science Compendium 2009 report warns that sea levels could rise by up to two metres by 2100 and five to ten times that over following centuries. (See salient features and links below)
It says that the losses from glaciers, ice-sheets and the Polar Regions appear to be happening faster than anticipated, with the Greenland ice sheet, for example, recently seeing melting some 60 percent higher than the previous record of 1998. The report warns that the pace and extent of climate change may exceed even the most sobering expectations voiced by the scientific experts of the Intergovernmental Panel of Climate Change(IPCC) in their 2007 Fourth Assessment Report.
The UNEP report is a presentation of scientific findings, interpretations, ideas, and conclusions based on about 400 major scientific contributions to the understanding of Earth Systems and climate. It also emphasizes that the pace and scale of climate change may be coming faster and sooner than previously predicted.
The Compendium, compiled in collaboration with scientists around the world, offers sobering findings that underscore the need to Seal the Deal in the Climate Negotiations in Copenhagen, Denmark. The Compendium also came just as the Group of 20 (G20) leaders gathered for a two-day summit in Pittsburgh, Pennsylvania hosted by US President Barak Obama, where climate change figured prominently on the agenda. The Compendium is based on the findings of more than 400 major peer-reviewed scientific studies and research institutions over the last three years.
Researchers have become increasingly concerned about ocean acidification linked with the absorption of carbon dioxide in seawater and the impact on shellfish and coral reefs. Water that can corrode a shell-making substance called aragonite is already welling up along the California coast decades earlier than existing models predict.
There is also growing concern among some scientists that thresholds or tipping points may now be reached in a matter of years or a few decades including dramatic changes to the Indian sub-continent's monsoon, the Sahara and West Africa monsoons, and climate systems affecting a critical ecosystem like the Amazon rainforest.
The report also underlines concern by scientists that the planet is now committed to some damaging and irreversible impacts as a result of the greenhouse gases already in the atmosphere. Losses of tropical and temperate mountain glaciers affecting perhaps 20 percent to 25 percent of the human population in terms of drinking water, irrigation and hydro-power.
Shifts in the hydrological cycle resulting in the disappearance of regional climates with related losses of ecosystems, species and the spread of drylands northwards and southwards away from the equator. Recent science suggests that it may still be possible to avoid the most catastrophic impacts of climate change. However, this will only happen if there is immediate, cohesive and decisive action to both cut emissions and assist vulnerable countries adapt.
The research findings and observations in the Compendium are divided into five categories: Earth Systems, Ice, Oceans, Ecosystems and Management. Key developments documented since the IPCC Fourth Assessment Report include:
Earth Systems
• A new climate modeling system, forecasting average temperatures over a decade by combining natural variation with the impacts of human-induced climate change, projects that at least half of the 10 years following 2009 will exceed the warmest year currently on record. This is despite the fact that natural variation will partially offset the warming "signal" from greenhouse gas emissions.
• The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. Global emissions were growing by 1.1 percent each year from 1990-1999 and this accelerated to 3.5 percent per year from 2000-2007.
• The developing and least-developed economies, 80 percent of the world's population, accounted for 73 percent of the global growth of emissions in 2004. However, they contributed only 41 percent of total emissions, and just 23 percent of cumulative emissions since 1750.
• Growth of the global economy in the early 2000s and an increase in its carbon intensity (emissions per unit of growth), combined with a decrease in the capacity of ecosystems on land and the oceans to act as carbon "sinks", have led to a rapid increase in the concentrations of carbon dioxide in the atmosphere. This has contributed to sooner-than-expected impacts including faster sea-level rise, ocean acidification, melting Arctic sea ice, warming of polar land masses, freshening of ocean currents and shifts in the circulation patterns of the oceans and atmosphere.
• The observed increase in greenhouse gas concentrations are raising concern among some scientists that warming of between 1.4 and 4.3 degrees Centigrade above pre-industrial surface temperatures could occur. This exceeds the range of between 1 and 3 degrees perceived as the threshold for many "tipping points", including the end of summer Arctic sea ice, and the eventual melting of Himalayan glaciers and the Greenland ice sheet.
Ice
• The melting of mountain glaciers appears to be accelerating, threatening the livelihoods of one fifth or more of the population who depend on glacier ice and seasonal snow for their water supply. For 30 reference glaciers in nine mountain ranges tracked by the World Glacier Monitoring Service, the mean rate of loss since 2000 has roughly doubled since the rate during the previous two decades. Current trends suggest that most glaciers will disappear from the Pyrenees by 2050 and from the mountains of tropical Africa by 2030.
• In 2007, summer sea ice in the Arctic Ocean shrank to its smallest extent ever, 24 percent less than the previous record in 2005, and 34 percent less than the average minimum extent in the period 1970-2000. In 2008, the minimum ice extent was 9 percent greater than in 2007, but still the second lowest on record.
• Until the summer of 2007, most models projected an ice-free September for the Arctic Ocean towards the end of the current century. Reconsideration based on current trends has led to speculation that this could occur as soon as 2030.
• Melting of the Greenland Ice Sheet surface also seems to be accelerating. In the summer of 2007, the rate of melting was some 60 percent higher than the previous record in 1998.
• The loss of ice from West Antarctica is estimated to have increased by 60 per cent in the decade to 2006, and by 140 percent from the Antarctic Peninsula in the same period.
• Recent findings show that warming extends well to the south of the Antarctic Peninsula, to cover most of West Antarctica, an area of warming much larger than previously reported.
• The hole in the ozone layer has had a cooling effect on Antarctica, and is partly responsible for masking expected warming on the continent. Recovery of stratospheric ozone, thanks to the phasing out of ozone-depleting substances, is projected to increase Antarctic temperatures in coming decades.
Oceans
• Recent estimates of the combined impact of melting land-ice and thermal expansion of the oceans suggest a plausible average sea level rise of between 0.8 and 2.0 metres above the 1990 level by 2100. This compares with a projected rise of between 18 and 59 centimetres in the last IPCC report, which did not include an estimate of large-scale changes in ice-melt rates, due to lack of consensus.
• Oceans are becoming more acidic more quickly than expected, jeopardizing the ability of shellfish and corals to form their external skeletons. Water that can corrode a shell-making carbonate substance called aragonite is already welling up during the summer along the California coast, decades earlier than models predict.
Ecosystems
• Since the 2007 IPCC report, wide-ranging surveys have shown changes to the seasonal behaviour and distribution of all well-studied marine, freshwater and terrestrial groups of plants and animals. Polar and mountaintop species have seen severe contractions of their ranges.
• A recent study projecting the impacts of climate change on the pattern of marine biodiversity suggests dramatic changes to come. Ecosystems in sub-polar waters, the tropics and semi-enclosed seas are predicted to suffer numerous extinctions by 2050, while the Arctic and Southern Oceans will experience severe species invasions. Marine ecosystems as a whole may see a species turnover of up to 60 percent.
• Under the IPCC scenario that most closely matches current trends i.e. with the highest projected emissions - between 12 and 39 percent of the Earth's land surface could experience previously unknown climate conditions by 2100. A similar proportion, between 10 and 48 percent, will see existing climates disappear. Many of these "disappearing climates" coincide with biodiversity hotspots, and with the added problem of fragmented habitats and physical obstructions to migration, it is feared many species will struggle to adapt to the new conditions.
• Perennial drought conditions have already been observed in South-eastern Australia and South-western North America. Projections suggest that persistent water scarcity will increase in a number of regions in coming years, including southern and northern Africa, the Mediterranean, much of the Middle East, a broad band in Central Asia and the Indian subcontinent.
Management
• The reality of a rapidly-changing climate may make conventional approaches to conservation and restoration of habitats ineffective. Drastic measures such as large-scale translocation or assisted colonization of species may need to be considered.
• Eco-agriculture, in which landscapes are managed to sustain a range of ecosystem services, including food production, may need to replace the current segregation of land use between conservation and production. This could help create resilient agricultural ecosystems better able to adapt to the changing climate conditions.
• Experts increasingly agree that active protection of tropical forests is a cost-effective means of cutting global emissions. An international mechanism of reducing emissions from deforestation and forest degradation (REDD) is likely to emerge as a central component of a new agreement in Copenhagen. However, many issues need to be resolved, such as how to verify the reductions and ensuring fair treatment of local and indigenous forest communities.
• A number of innovative approaches are emerging to keep carbon out of the atmosphere, including the use of "biochar", biologically-derived charcoal. It is mixed in soils, increasing fertility and potentially locking up carbon for centuries. This is a 21st century application of a technology known as Terra Preta, or Black Earth, used by Amazon peoples before the arrival of Europeans in South America.
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