Global warming theory represents one of the greatest scientific con games in history. The putative intellectual foundations are based on data manipulated to support the desired conclusion, and have been conclusively debunked.
Andrew G. Bostom pulls together a beginning history of the steps by which the theory was sold. Unscientific studies came to be embraced as conclusive, their debunkers targeted for abuse. The remarkable hockey stick graph and the effort to "get rid" of the Medieval Warm Period (whose temperature rise dwarfs anything in the last century) are among the scandalous abuses of science covered here.
Those who want to marshal the evidence to induce skepticism in friends who fall for warmist propaganda should read and save this article
. The science is explained lucidly, so that any serious reader can comprehend the issues. It is not a quick and light read, but it repays an investment of a few minutes of serious attention.