An extensive and documented reply is given at Quora from John Walker, former Laboratory Medical Director/Pathologist (1984-2011). Excerpts in italics with my bolds.(red text is link)
There are very few individuals who are skeptical that the climate changes. But there are millions and millions of individuals (and growing), who are quite skeptical that human emissions of CO2 are causing apocalyptic global warming, including many scientists, climate scientists, Nobel Laureates, and other highly educated individuals.
The reason for this is multi-factorial and very voluminous. The following presents condensed summaries of 12 of the reasons that so many individuals have become highly skeptical of the theory of CAGW. Even though it is rather long, it represents only a small portion of the information, studies and references engendering skepticism of this unproven assemblage of hypotheses. Most…
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