[ancient_geezer]

I wonder what we'd do for serious global cooling - burn forests just for the CO2?

CO2 levels 20 times higher than today have been accompanied by deep ice ages at global average temperatures more than 10^o C lower than today. CO2 from burning the forests is unlikely to help much against the cooling effects associated with deep ice ages. The change in earth's albedo (reflectivity) just from increasing the size of ice caps is much greater effect.

[ancient_geezer]

P.S. I suppose one could dump the ashes from burning off all the earth's forests and reduce albedo enough to take the edge off. Of course burning off all the forests would be a bit of an issue ecologically.

But what the heck, get out the marshmallows and hotdogs and lets make it a party.