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Our interglacial, the Holocene, began about 13,000 years ago, so we’re well past the half-way point in this cycle of warming and looking at a new glacial in the next few centuries or millennia.

Finally, a retired scientist who emailed me after reading one of my climate columns in the Times Colonist observed: “Most of my geology friends are skeptics — but it has become politically incorrect to voice such views.” Geologists tend to question the anthropogenic theory because their education tells them that current climate conditions are not unusually warm, based on either the past few thousand years, or the past few hundred thousand years, or the past tens of millions of years, or even the past hundreds of millions of years.Paul Mac Rae, June 24, 2008 Most geologists aren’t part of Al Gore’s “100 per cent consensus” of scientists that humans are the principal cause of global warming and that we have to take drastic steps to deal with it.For example, in March 2008, a poll of Alberta’s 51,000 geologists found that only 26 per cent believe humans are the main cause of global warming.Natural climate variability over recent geological time is greater than reasonable estimates of potential human-induced greenhouse gas changes.Because no tool is available to test the supposition of human-induced climate change and the range of natural variability is so great, there is no discernible human influence on global climate at this time. Is it because they are, as Gore and the “consensus” charge, in the pay of the oil industry?

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