The success of Al Gore’s global warming shockumentary An Inconvenient Truth has created a very convenient truth for companies that sell “carbon offsets,” reports today’s edition of The Tennessean: Rising sales. Meanwhile, it turns out that the company from which Gore gets his own carbon offsets spends very litle of its revenue on carbon-offsetting projects, according to a recent study by the Tufts University Climate Initiative. More on that in a minute. And read this whole post - it isn’t just about Gore and his carbon offsets, but about the larger issue of whether carbon offsets are in and of...