ScienceDaily (Oct. 21, 2011) — A common argument against global warming is that the climate has always varied. "Temperatures rise sometimes and this is perfectly natural," is the usual line. However, Svante Björck, a climate researcher at Lund University in Sweden, has now shown that global warming, i.e. simultaneous warming events in the northern and southern hemispheres, have not occurred in the past 20 000 years, which is as far back as it is possible to analyse with sufficient precision to compare with modern developments.
http://www.sciencedaily.com/releases/2011/10/111021074532.htm
The Moon is Full
No Simultaneous Warming of Northern and Southern Hemispheres as a Result of Climate Change for 20,000 Years
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