Dr David Evans, formerly of the Australian Greenhouse Office, distils the science and politics of climate change into two documents highly approachable for the layman. If you read nothing else, read these:
Climate Coup – The Science [PDF download link]
Our emissions of carbon dioxide cause some global warming, and it has indeed warmed over the last century. But this doesn’t prove that our emissions are the main cause of that warming—there might be other, larger, natural forces on the temperature. The key question is: how much warming do our emissions cause?
Climate scientists use their climate models to estimate how much. In this article we check their main predictions against our best and latest data, and find they got them all wrong: they exaggerated the warming of the air and oceans, they predicted a very different pattern of atmospheric warming, and they got the short-term relationship between outgoing radiation and surface warming backwards. The latter two items are especially pertinent, because they show that the crucial amplification due to the water feedbacks (mainly humidity and clouds), that is assumed by the models, does not exist in reality. This amplification causes two-thirds of the temperature rises predicted by the models, while carbon dioxide only directly causes one third. This explains why the models overestimate temperature rises.
We check the performance of the climate models against impeccably sourced, publicly-available data from our best and latest instruments. See the endnotes for how to download the data yourself.
Climate Coup – The Politics [PDF download link]
The climate models are incompatible with the data. You cannot believe both the theory of dangerous manmade global warming and the data, because they cannot both be right.
In science, data trumps theory. If data and theory disagree, as they do here, people of a more scientific bent go with the data and scrap the theory.
But in politics we usually go with authority figures, who in this case are the government climate scientists and the western governments—and they strongly support the theory. Many people simply cannot get past the fact that nearly all the authority figures believe the theory. To these people the data is simply irrelevant. Society needs most people to follow authority most of the time, just like an army needs soldiers who do not question orders.
The world’s climate scientists are almost all employed by western governments. They usually don’t pay you to do climate research unless you say you believe manmade global warming is dangerous, and it has been that way for more than 20 years. The result is a near-unanimity that is unusual for a theory in such an immature science.



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