Time Magazine: Basic biology suggests that plants might grow faster in a world with more carbon dioxide, and field experiments bear that out: when you pump extra CO2 into a field or a forest, trees and other vegetation tend to get bigger. There are plenty of caveats attached: without other nutrients, the size and health of CO2-enriched plants can be compromised, and in some cases noxious weeds like poison ivy do better than the greenery you might prefer. But perhaps the biggest question of all is …