[Centurion2000]

In other words, the extinction was precipitated by global warming, rather than an asteroid collision, the reigning theory.

Actually the leading theory is that there was a series of cataclysmic volcano eruptions that pushed up so much CO2 and SO2 that it killed most life off.

But that would not fit with their agenda. Global Warming my a$$. Most of the northern hemisphere is cool temperate climate. We could use more warming to make those areas more arable and habitable.

[Zon]

Actually the leading theory is that there was a series of cataclysmic volcano eruptions that pushed up so much CO2 and SO2 that it killed most life off.

The paragraph I quoted in my response at #1 says basically that.

[expatpat]

More likely Global Winter than Global Warming. The oceans recede when a lot of the precipitation around the earth gets locked up as ice and snow on dry land, instead of returning via rivers to the sea.