Carbon Credits, A Pipedream?

Sec. Vilsack may be overpromising (I know, he's a politician so that's totally surprising) when he says farmers can replace direct payments with payments for carbon credits. That's the message of this Marcia Zarley Taylor post at DTN:

The number one challenge facing pro-carbon trading farm groups at the moment is proving that agriculture's contribution to carbon reduction can be real, "additional" and permanent, others Ag Carbon Market Group members say.

Here are two GAO products which are relevant