How much of a role do humans play in climate change? A new report scheduled to come out on Friday will give scientists' latest take on the topic. ...
The last report, in 2007, indicated that it was "very likely" that humans were responsible for most of the observed warming -- a judgment that corresponds to a confidence level greater than 90%. A draft that leaked in August raised that confidence level to "extremely likely," or greater than 95% confidence that humans are responsible for the majority of global warming through carbon pollution.
Climate change: U.N. summary of latest science coming Friday
Global Warming Is Very Real