[chimprich]

> but more arable land.

This is dangerously fantastical thinking. Global heating gives us less arable land. It becomes harder to grow crops as the temperature increases. This is a much bigger negative effect than any positive effect from CO2 increases. A lot of current arable land in the tropics will become unusable.

Or are you thinking of growing crops in recently-defrosted tundra in Siberia? In which case, how are you going to get political agreement to grow stuff there, get high enough soil quality, irrigate it, and move all the farmers from, say, India to there to work it?