The outcome of the historic climate change negotiations in Copenhagen hinges on the issues of emissions reductions and financing, Secretary-General Ban Ki-moon said today as he urged world leaders to use the final days of the talks to strike an ambitious new agreement. The Nobel Peace Prize-winning Intergovernmental Panel on Climate Change (IPCC) has found that to stave off the worst effects of climate change, industrialized countries must slash greenhouse...

India will become the world’s most populous country in 2025, surpassing China, where the population will peak one year later because of declining fertility, according to United States Census Bureau projections released Tuesday. The bureau suggests that the projected peak in China, 1.4 billion people, will be lower than previously estimated and that it will occur sooner. With the fertility rate declining to fewer than 1.6 births per woman in this...

Arnold Schwarzenegger, Al Gore, Wangari Maathai, Desmond Tutu and a host of other celebrities descended here on Tuesday for the climate summit, rubbing shoulders with NGOs dressed as angels, penguins and trees. As television crews chased celebrities around the sprawling summit venue — the Bella Centre — and scrums broke out to enter the rooms where they were speaking, the relatively few NGO representatives allowed inside found innovative ways of spreading...

Governments and people have to make choices about accepting new scientific developments into their daily lives. Many attribute high levels of objectivity and integrity to scientists, which is not true of many of them. Scientists have been known to manipulate results to their advantage. Scientific issues are often complex, there are differing views among scientists and the layman finds it difficult to decide which scientific course is harmful or beneficial....

In energy infrastructure alone, the transformational ambitions the Copenhagen meet is expected to set will cost more than $10 trillion in additional investment.  If negotiators reach an accord at the climate talks in Copenhagen it will entail profound shifts in energy production, dislocations in how and where people live, sweeping changes in agriculture and forestry and the creation of complex new markets in global warming pollution credits. So what is...