...global warming actually began around 10,000 BC, when the ice sheets that had covered large portions of North America and Eurasia retreated to the poles. And what has happened since this (entirely natural) warming began? The Neolithic Revolution, the dawn of civilization and the expansion of human populations like never before.
Well, it 'flourished' until the Obozoites took over, anyway.
And for that entire 10,000 year time frame, global temperatures have stayed within 1/2 degree C either way of modern averages (you can find that data in the NASA link I provided earlier). I'd suggest it would be wise to keep it that way as long as possible. Without the effects of man, we'd be expecting another ice age in about 80,000 years because of earth orbit and wobble. And you know what? At that point, maybe it would make sense to pump a bunch of surplus carbon into the atmosphere to stave off the glaciers. Heck, by then, if we're still around, we'll likely have the know-how to suck the carbon back out once we're out of danger, compress it into diamonds and store it underground until it's needed again. But we're not quite there yet.
I kinda prefer the middle-ages warming temps. Mostly because it cuts down on heating bills, which the damnfool Green Goddess worshipers have jacked up beyond the means of the 99%.
Sorry. Though northern Europe might have experienced an extended warming period (some suggest certain ocean currents might have suddenly stopped for some reason), globally temperatures were actually below average: http://www.skepticalscience.com/medieval-warm-period.htm
The ocean currents couldn't have possibly stopped during the medieval warm period. Only humans and their SUVs can make ocean currents stop... or glaciers melt...
And of course, there's this:
how can we be critical of Crowley for throwing out 40-years in the
middle of his calibration, when we’re throwing out all post-1960 data ‘cos the
MXD has a non-temperature signal in it, and also all pre-1881 or pre-1871 data
‘cos the temperature data may have a non-temperature signal in it!
IPCC swallowed the managed data whole, and NASA's page uses that data.
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