In the HW comments recently there was been a bit of a discussion (no, not really a debate) about scientific consensus and climate. Here's a video that should help you work through all the ifs, buts and maybes that are inherent in any climate science debate.
Over to you, John Oliver.
Cook, John, Dana Nuccitelli, Sarah A. Green, Mark Richardson, Bärbel Winkler, Rob Painting, Robert Way, Peter Jacobs, and Andrew Skuce. "Quantifying the consensus on anthropogenic global warming in the scientific literature." Environmental Research Letters 8, no. 2 (2013): 024024.doi:10.1088/1748-9326/8/2/024024