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kotsy
Avatar Superstar

Registered: Jul 2006
Location: Underground
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Feb-09-2009 06:44
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electro88
__/\___\o/____

Registered: Feb 2007
Location: Kitchener/Toronto
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Feb-09-2009 09:35
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matty
08/09 National Beach Cham

Registered: Jun 2003
Location: back in T.O
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Re: Re: Re: spring already????
| quote: | Originally posted by Intangible
I don't know about that. Im no expert but I was watching a discovery channel documentry about ways earth may meet it's end and while earth historically spends most it's time in an 'ice age' scientists believe it's related to the geographic position of earth to the sun. Apparently these scientists say that after looking at earths trends and positioning we should be safe for another 30000 years. |
Um, no Earth has not historically spent most of the time in a period of glaciation.

This is going back to the Cretaceous, around 140 Ma ago. Don't forget that the earth was hot enough to stay molten for the first 2 or so billion year. It wasn't until the Paleoproterozoic that stable cretons started forming. Several hundred million years later, the emergence of stromatolites and the start of the carbonate-silicate cycle brought the temp down by locking up a lot of the CO2 and pumping more O2 into the atmosphere.
There were several large scale glaciations, one of the biggest being the Huronian, around 2.45-2.22 Ga ago. The ocean level was similar then as it is today. There were three episodes of glaciation during that time, each one followed by an abrupt warming period. This was followed by the Cryogenian or as some have called it "Snowball Earth", during the Neoproterozoic (Roughly 800Ma ago, lasting for about 200Ma). There were also a few smaller periods during the Phanerozoic, one of them being the current one we're in. Technically we're in a interglaciation period and could go back into glaciation at any time.
Long story short, earth has spent most of its time in a very warm climate as indicated by the paleo sea level estimates. Is global warming occuring? Sure. But seeing how earth has been much hotter then it is now for a long period of time it is not surprising.
Sorry about the long post. If you want more into i'd be glad to provide it 
EDIT: I just realized that i didn't explain the graph. Here is a simpler one showing the sea level going back to the Cambrian. As you can see since then there have been two episodes where the sea level was at the same depth as it is now suggesting that the temperatures were much higher through out history.
Last edited by matty on Feb-09-2009 at 16:41
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Feb-09-2009 15:46
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