A Global Warning: film on History Channel |
| Published: November 13, 2007, 11:01 pm |
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The History Channel presented its documentary on Global Warming today, the second major television documentary on this in less than a month (the other was Anderson Cooper's Planet in Peril , discussed on this blog Oct. 23). It is called A Global Warning (by Chris Hoskins?) and presents much more material about natural change in global temperatures than have other documentaries. About 650 million years ago we had snowball earth because somehow a lot of carbon dioxide dissolved, leading to freezing and ice reflection. Evidence of this can be found with dropstones in the Mojave Desert (the film incorrectly placed Death Valley in Nevada). Even at the Equator the earth froze. Then volcanic activity released more CO-2 and the ice melted. A couple other major warmings and extinctions happened about 250 million years ago and then 60 million years ago. They could have been caused by massive volcanism in Siberia, or by changes in the earth's orbit (becoming more [ Full article ] |
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