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To find out, the team used ancient DNA to discover cases of turnover that are hard to observe from fossils alone. They then carbon-dated the bones of the ingoing and outgoing animals to work out when these turnovers happened. Finally, they plotted these dates against an accurate record of North Atlantic climate over the past 60,000 years, gleaned from Greenland ice and Venzeuelan sediments.
Most of the replacement events lined up with sudden bursts of warming called Dansgaard-Oeschger (D-O) events, which happened a lot between 12,000 and 60,000 years ago. In each one, average temperatures abruptly rose by anywhere from 4 to 16 degrees Celsius in just a few decades, before gradually falling again over several millennia. If you plot the temperatures on a graph, you see a distinctive sawtooth pattern—sharp upward spikes of warming and then gentle downward slopes of cooling. “They’re the most abrupt changes in climate that you got in the Pleistocene—those transitions from cold to warm,” says Cooper.
originally posted by: grandmakdw
Mankind is just arrogant
enough to think they can cause it
originally posted by: imod02
Climate Change, does any one else feel that this has become a religion, Only the high priest of CC can save us, we must worship the CC god and do the bidding of its priests. Any one who does not believe is destroying the world.
Thats all the world needs, another mad religion
originally posted by: Krazysh0t
How is this evidence against Climate Change? Because you think you've discovered a tenuous link to it that may disprove it through certain reasoning?
Why do you deniers always have to do these roundabout measures to try disprove climate change? Can't you just look at the data itself and see if it is flawed? Nah, it's easier to create strawmans out of other sciences to prove your point...
originally posted by: BomSquad
a reply to: AndyMayhew
I have an open mind on the whole climate change debate. The only thing I am leery of is all these reports that it could ONLY be man made. I don't believe that at all.