A meaningful contribution by a once supporter of “global warming” need for action, provides much needed rational discussion.

““The certainty among many scientists that humans are the main cause of climate change, including global warming, is not based on the replication of observable events. It is based on just two things, the theoretical effect of human-caused greenhouse gas emissions, predominantly carbon dioxide, and the predictions of computer models using those theoretical calculations. There is no scientific “proof” at all.” “