Has anyone or any research body ever done the calculations to work out
how hot the earth would have to get before a runaway greenhouse effect
kicked off? I don't mean where it rapidly warmed a few degrees then
stopped , I mean a venus style effect with boiled off oceans. Since
some 5 mile wide impacting asteroids with accompanying global
firestorms in the past haven't managed it I doubt we will with too
many 4x4s and coal fired power stations , but I'm just curious as to
what it would take to push the climate so far it never came back.

B2003

"Boltar" wrote in message
oups.com...
Has anyone or any research body ever done the calculations to work out
how hot the earth would have to get before a runaway greenhouse effect
kicked off?

I don't know but the risk is increasing with time as the sun gets hotter and
it will happen eventually. I've seen it suggested that the oceans will be
gone in 500 million -1 billion years time but it could be sooner giving the
right combination of circumstances.

John