>Back in the 80s I worked on a fuel ethanol development. Ethanol is produced by yeast converting sugar to 50% ethanol and 50% Co2. One proposal of using the Co2 was to pump it into greenhouses so plants would grow faster to increase the output of crops. It seems to me that it would help restore the planet's forests faster if the Co2 levels were increased. Other than the hype of the oceans raising, the planet would benefit from increased Co2 and temperature by producing more trees and more food.
Once in 1969 there was an eruption of CO2 in Be[c caron]ej (see
http://www.youtube.com/watch?v=y44vAAZQvuQ how it looked). The farmer in the video remembers how all his hens died that night and how they had to run at 3am, and then shows how everything started growing much more abundantly.
