contrails

Originally Posted by glidergeek

On Dec 26, 2:36*am, delboy wrote:
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

Ya tell that to the Vikings that got forced out of farming Iceland in
the 14 century, who caused that?

The people (of Viking origin) that were farming Iceland in the 14th century did not stop farming there and their decendants are still farming Iceland.
You may be thinking of Greenland?