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Politics : Formerly About Advanced Micro Devices
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To: Sdgla who wrote (829766)1/13/2015 12:36:33 PM
From: Wharf Rat  Read Replies (1) of 1576886
 
"CO2 is the only thing between u and the next ice age. "

300 years ago. Time marches on.

Just when did humans first start affecting the climate?

...Pre-industrial human influence kept the climate warmer than it would otherwise have been, insulating us and delaying the normal slide back into the next ice age that had happened at the tail end of all the prior interglacial periods. But although their effect was diminished, natural orbital changes did not relinquish overall control on our climate, which carried on cooling over the last 6,000 years despite pre-industrial emissions. When CO2 levels were reduced by the American population collapse, our climate flirted with glacial conditions in the Little Ice Age.

But everything changed in the industrial era, when humans finally snatched control of the climate away from the natural, orbitally-driven cycles that had governed the climate and punctuated our evolution and dispersal throughout the last several million years.

In just the last century or two, 6,000 years of orbitally-driven cooling temperatures have been entirely reversed! (see the graph below). That's because greenhouse gasses are now 68% more abundant in the atmosphere than they were in 1750, and the trend is sharply higher still, to levels and temperatures not seen since long before the evolution of our first fire-making ancestor, Homo erectus....
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