Little doubt that humans are the cause of global warming
A draft report by the Intergovernmental Panel on Climate Change concludes that greenhouse gases released by human activity are responsible for
a hotter world. Scientists nearly certain that humans have caused global warming
Change in global surface temperature since 1901
A few of the panel's observations and conclusions
• Carbon dioxide in the atmosphere has increased by more than 20 percent since 1958, and by more than 40 percent since 1750, caused mostly by deforestation and the burning of fossil fuels.
• The atmosphere and oceans are warming, permafrost is thawing, the rise of sea levels is
accelerating, the extent and volume of snow and ice is diminishing, and oceans are becoming more acidic.
• Each of the past three decades has been warmer than all preceding decades since 1850, when records began. The past decade was the warmest.
• Limiting the effects of global warming would require sustained reductions of greenhouse gas emissions. Regardless, many aspects of global warming will persist for centuries.
SOURCE: Source: IPCC WGI Fifth Assessment Report.