eskeptic posted this article on 2-8-12 about AGW:
How We Know Global Warming is Real
and Human Caused
A few excerpts:
How do we know that global warming is real and primarily human caused? There are numerous lines of evidence that converge to this conclusion.
…
Carbon Dioxide Increase. Carbon dioxide in our atmosphere has increased at an unprecedented rate in the past 200 years. Not one data set collected over a long enough span of time shows otherwise. Mann et al. (1999) compiled the past 900 years’ worth of temperature data from tree rings, ice cores, corals, and direct measurements of the past few centuries, and the sudden increase of temperature of the past century stands out like a sore thumb.
…
Melting Polar Ice Caps. The polar icecaps are thinning and breaking up at an alarming rate. In 2000, my former graduate advisor Malcolm McKenna was one of the first humans to fly over the North Pole in summer time and see no ice, just open water. The Arctic ice cap has been frozen solid for at least the past 3 million years and maybe longer, but now the entire ice sheet is breaking up so fast that by 2030 (and possibly sooner) less than half of the Arctic will be ice covered in the summer.
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Melting Glaciers. Glaciers are all retreating at the highest rates ever documented. Many of those glaciers, especially in the Himalayas, Andes, Alps, and Sierras, provide most of the freshwater that the populations below the mountains depend upon—yet this fresh water supply is vanishing.
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Sea Level Rise. All that melted ice eventually ends up in the ocean, causing sea level to rise, as it has many times in the geologic past. At present, sea level is rising about 3–4 mm per year, more than ten times the rate of 0.1–0.2 mm/year that has occurred over the past 3000 years.
Michael Shermer, founder of The Skeptics Society and editor and chief of Skeptic, appears to have flipped in 2006. According to this Scientific American article titled The Flipping Point, Mr. Shermer was persuaded to change his mind by what he read in 4 books:
The Long Summer (Basic, 2004)
Collapse (Penguin Group, 2005)
Field Notes from a Catastrophe (Bloomsbury Publishing, 2006)
The Weather Makers (Atlantic Monthly Press, 2006)
I cannot draw any conclusions from any of this other than to say that It looks like Shermer, of all people, has been hoodwinked. He isn’t one of those politically motivated individuals as far as I can see. What happened?