Consensus of Papers
What does peer-reviewed literature have to say about climate change? The seminal work of Naomi Oreskes in 2004 analysed peer-reviewed scientific papers and found unanimous scientific agreement. Follow-up research by the Skeptical Science team quantified the consensus in the scientific literature from 1991 to 2011, finding a 97% agreement.
Source: Denial101x (a MOOC from UQx and edX)