Quote:
Originally Posted by oil pan 4
Then why didn't that happen when CO2 levels were 1,600ppm not that many millions of years ago.
|
These 'Hot-House Earth', 'Ice-Ball Earth' episodes occurred on an 'Earth' which no longer exists.
There have been broadcasts on PBS which addressed the particulars of those phenomena. I'm not sure that I have any notes on it.
We are talking about a planet devoid of any ice at all at times.
Times of heavy meteoric and cometary bombardment along with millions of years of continuous volcanic eruptions and lava flows.
Zero vegetation.
Zero plankton.
Times of massive ice sheets.
No opening yet of the Bering Sea.
No Drake Passage
No Circumpolar Circulation.
Tropical weather at both poles.
There was enormous changes in orbital solar-forcing due to the three Milankovich cycles.
A number of mass extinctions.
It'd amazing stuff!
I'll look around.
Thanks for bringing it up.