Not really a continuation of this thread,
but in connection with the title,
I found the article by Freeman Dyson at
http://www.edge.org/3rd_culture/dysonf07/dysonf07_index.html
very interesting on this topic.

Dyson claims that if appropriate plants were grown
so that the soil-level rises by 1/100 inch per year,
this would counter the increase in CO2
(by incorporating carbon into the soil).

Dyson (who is an eminent mathematical physicist)
is a skeptic rather than a denier on climate change.
He believes the CO2 cycle is more complicated than is usually thought.




--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland