Perhaps that is the argument, but corn or sugar cane or whatever don't magically become diesel. There's energy and other external costs put into the system, pol

Perhaps that is the argument, but corn or sugar cane or whatever don't magically become diesel. There's energy and other external costs put into the system, pollution by fertilizers, etc. Then again, growing trees on the same agricultural land would sequester how much carbon? And trees would be processed to building materials (among other uses) not released back into the atmosphere so quickly.