UN climate change chief Christiana Figueres is a long distance runner and constant traveler who calls wherever she is "home." Here is a thumbnail profile.
How UN climate change chief Christiana Figueres became a fierce crusader to lower Earth's thermostat. A visceral connection to the planet – from the now-extinct golden toads of her childhood in the Costa Rican jungle to shrinking glaciers – moves her to tears.
Previous agreements to restrict greenhouse-gas emissions, including Kyoto, have largely failed. To curb global warming, negotiators are hoping countries will design and enforce their own cuts.
Top international scientists will take part in an independent review of the Intergovernmental Panel on Climate Change (IPCC) and its reports on global warming, which have been widely criticized recently for inaccuracies.
Carbon emissions affect more than the climate. Scientists now suspect they are also making Alaskan seas more acidic.
As the world gets warmer, strategies for helping wildlife adapt.