Roger W. Norman wrote:

"Bob Cain" wrote in message
...

Roger, do you have any good sources on how much of a threat
that is and what we are possibly doing that could affect that?


Sources? How about the mass extinction of about 245 million years ago,
which has come down to being a eruption of methane sulfate during a warming
period (way before humans were supposedly doing the warming) and, although
it took a few thousand years because it wasn't enough to cause immediate
extinctions, we're talking about virtually all land based life and 70% of
ocean born life.

Roger, I wasn't challenging you, I just want to look further
into this and to find out to what degree the global effects
civiliation is having on the planet influence that phenomenon.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein