-The Times of India The cost of air-conditioners and refrigerators could go up considerably starting next summer if the US and other rich countries force a decision at the UN climate talks in November at Doha, to order a global ban on existing refrigerant gases and replace them with costly though relatively more climate-friendly alternatives. One of the alternatives being proposed is produced jointly by DuPont and Honeywell, two US-based multinationals, and...

-Al Jazeera Treaty to ban chemicals that harmed the ozone layer came about when there was consensus between science and politics. In 1974, chemists Mario Molina and Frank Sherwood Rowland published a landmark article that demonstrated the ability of chlorofluorocarbons (CFCs) to break down the ozone layer, the atmospheric region that plays a vital role in shielding humans and other life from harmful ultraviolet (UV) radiation. It marked the opening salvo of...

John Vidal, who was in Rio for the '92 Earth summit, looks back at that momentous event, and how the 2012 version compares Helicopters thundered up and down the chic Copacabana and Ipanema beaches. Tanks guarded the bridges and tunnels. The favelas were in lockdown, schools closed and supermarkets stood empty. Unexpectedly, George H W Bush, the 41st US president, flush with success at the collapse of communism, had arrived in...

-The Guardian  Governments spend years negotiating environmental agreements, but then willfully ignore them – it's a dismal record It's global agreement time again. In two weeks, 120 world leaders and 190-odd countries will go to the Rio+20 Earth summit and – unless the talks collapse – sign up to new international goals, pledges, targets, protocols and treaties, and promise to commit to sustainable development, protect the earth and use resources more wisely....

-The United Nations   Signs of ozone depletion are again appearing over the Antarctic, the United Nations reported today, adding that prevailing temperatures and polar stratospheric clouds indicate that the degree of ozone loss this year will most likely be about average in comparison to the past decade. However, the World Meteorological Organization (WMO) noted that it is still too early to make a definitive statement on the level of depletion of ozone...