On Dec 25, 6:31*pm, brian whatcott wrote:
delboy wrote:
/snip/ 2) There is geological and fossil evidence to suggest that it has been
hotter in previous eras, but life on earth was not wiped out.

Recent investigations suggest most extinctions have occurred at the hot
point of climate cycles, I read in a recent copy of New Scientist (sorry
the reference is wishy-washy...)

Brian W

There have also been extinctions at the cold points, including our
near relatives the neanderthals, who failed to survive the last ice
age!

Derek C