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Originally Posted by Pinner
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A lot of the evidence around that period involves local warming (i.e. Vikings travelling further north), but a common mistake is to confuse weather with climate.. local temperatures and conditions can vary, but the question is about the globe as a whole. One area can be much warmer while another can be cooler to offset that warming.
http://books.nap.edu/openbook.php?re...=11676&page=R1
http://www.ncdc.noaa.gov/paleo/pubs/...oberg2005.html
http://www.meteo.psu.edu/~mann/share...lScience09.pdf
Plus they can correlate things like solar output and volcanic activity causing the medieval period to be warm, and see that those things aren't impacting our current warming trend.
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Originally Posted by Pinner
Climate changes are normal and the Polar Bears have likely survived through hundreds of them.
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So? Just because they have survived previous ones doesn't mean they will survive this one. Species do go extinct after having been around for millions of years.
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Originally Posted by Pinner
I still don't understand why the Sun's warm/cold cycles are rarely blamed for earth's warm/cold cycles ??
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Because solar irradiance has gone down since 1960 while at the same time the temperature has gone up.
They do know about various cycles of solar radiation and our distance to the sun and tilt of the earth and they take all those things into account when looking at causes and such. They know we're in an interglacial warm period right now. I don't think it's reasonable to think they overlooked such a simple thing.