John Peterson on July 4 (Letters) argued that global warming was a hoax. The counter-evidence is convincing.
Google lists about 37.6 million articles on global warming, including articles both pro and con. Obviously not all articles are credible. The purpose of the Intergovernmental Panel on Climate Change, created in 1988 by the World Meteorological Organization and the U.N. Environmental Programme, is to evaluate the state of climate science primarily on the basis of peer-reviewed and published scientific literature. The IPCC publishes its report only about every five years, as it responds to comments from over 50,000 scientists worldwide, so the process is tedious.
The conservative IPCC reports have gradually gone from being tentative on global warming to being positive. Peer review is the process of giving credibility to scientific reports by requiring experts in the area of the report to critically evaluate, in writing, the candidate report.
Prior to publication, such a report must satisfy the reviewers or it is not published. At last count, 928 global warming reports agreed that global warming is real: Zero peer-reviewed published reports stated that mankind was not causing global warming.