Human activity and climate over history

Once again from Nasa: Rise of Agriculture May Have Cooled Climate. A cooling of up to 2-degree Fahrenheit over land between 1000 and 1900 AD may have been caused by changes from natural vegetation to agriculture. Previous studies had attributed cooling to natural climate variations, but new research published in Geophysical Research Letters suggests that much of this cooling could have been the result of human activity. (Lawrence Livermore National Laboratory release) [NASA’s Earth Observatory]

After the to and fro on climate change yesterday, here’s confirmation that understanding the atmosphere and the impact humans have on it is very much a moving science.

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