Washington Post: Here’s something to ponder as you park your Prius: What if gas guzzling isn’t the problem? That rather counterintuitive theme emerged yesterday from a visit to Washington by James E. Hansen, director of NASA’s Goddard Institute and one of the first to sound the alarm about global warming in a congressional hearing 20 years ago yesterday. As he undertook a commemorative, I-told-you-so tour, from Diane Rehm’s radio show to ABC News to the National Press Club to the House of …