I hope you re-read your post. Other than completely bizarre chapter on how every American has AC and we are a OK, the paper has nothing to do with Environmental Economics, specialty of both authors. But of course, Joe the Plumber wasn’t expert on tax policy either, and he was in every talking point during election.
In the bill that passed the House, agriculture industry got a large number of carbon credits. Even if they didn’t, claiming that $60/ton higher fertilizer costs will cause world famine is silly. In 2008 fertilizer prices went up $200 to $300/ton and the world is still around.