The latest IPCC report came out today. This is part of a six year process involving thousands of scientists. As Climate Progress points out:
This report has to be signed off on by 120 governments, including the United States, and oil countries like Saudi Arabia. And they can veto any word. So you can take to the bank anything that all those countries agree to.
If you like going straight to the source, you can read the IPCC summary for policy makers on their site (pdf). Our (somewhat shorter) take on it is here.