Over the last five years, 600 scientists from the Intergovernmental Panel on Climate Change sifted through thousands of studies about global warming published in forums ranging from scientific journals to industry publications and distilled the world’s accumulated knowledge into this conclusion: “Warming of the climate system is unequivocal.” (Earth observatory)

Global warming is already affecting the world we know, endangering polar bears, shortening ski seasons and creating more intense storms. (Natural Resources Defense Council)

Kyoto is meant as a tiny first step by rich nations to slow global warming that many scientists say could spur more heatwaves, droughts, floods, more powerful storms and swamp coastal areas by melting ice sheets in Antarctica and Greenland. (Global Warming International Center)