On Tue, Sep 18, 2012  Roger Clough <rclo...@verizon.net> wrote:

> > Could those  that beieve in global warming please explain how the earth
> warmed up after each ice age ?

Nobody knows for certain. There was a Mega Ice age 2.4 billion years ago
and another one 700 million years ago where the entire oceans froze over,
even at the equator there were hundreds of feet of ice covering the sea.
The most popular theory is that they both ended when huge volcanic
eruptions injected vast amounts of black soot and greenhouse gases into the
air that warmed things up. Interestingly Evolution seemed to take a big
jump right after both Mega Ice Ages ended. Right after the first one
advanced eukaryote cells started to show up, and right after the second we
had the Cambrian Explosion and multicellular lifeforms. Why that should be
is not clear.

  John K Clark

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