"bill" wrote in message
ups.com...
"George" wrote in message

He also assumes that the environment in which we all live could
sustain
such levels. I don't think there is any precedent for that
assumption.

I don't think plants will complain.

How do you know? The planet has never sustained those levels.

800 ppm?

800 ppm will easily desertify the planet and melt all the ice.

increased temperature accelerates the evaporation precipitation
cycle, really, you are looking at more tropical type climates and less
desert.

It isn't that simple. Increased CO2 increases the temperature, which
increases the evaporation rate, which increases precipitation - in areas
where there is precipitation. Deserts (the Sahara, for instance), by and
large, aren't benefiting from such a scenario, and in fact, are growing as
we speak.

George