unlinear

"Common sense" says we need biofuels (ethanol from corn) to cut down on GHG emissions to curb global warming... so what's the problem here?

If the lily pad patch was a mere 1 square inch, on the 48th doubling, the pond would have to be (check my math)about 70k square miles - or 10 times the size of Lake Erie. Those lilies would be consuming a serious amount of co2 during that last doubling!