Current rates of temperature increase, if accurate, don’t look all that startling despite the odd few hot days. For example, Roy Spencer reports a linear warming trend of +0.13C per decade since 1979. We know previous cooling trends must have occurred over the centuries from the regular advance and retreat of glaciers, to cite one obvious line of evidence. Focussing on CO2 all the time is a bit like looking through the wrong end of the telescope.
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How did plants and animals survive around 200 million years ago when the carbon dioxide concentration went up to 6,000 parts per million?
Paul Olsen, a geologist and paleontologist at Columbia Climate School’s Lamont-Doherty Earth Observatory, walked us through what scientists know about carbon dioxide levels over time, says Phys.org.
Although no one was around to measure the atmosphere’s CO2 concentration millions of years ago, paleoclimatologists can reconstruct…
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