He's pulling an old magician's trick, he's distracting us with one hand (AKA his super green friendly house) while his other hand performs the deception (his super electricity consuming home). Prick. No one wanted to watch "The Inconveniant Truth" in Bio, but it's required. Every.... damn... year. The best part of the movie is when the audience laughs at him for being turned down as president. Good stuff.
And today's modern car emits less carbon emissions (about 50% less), but requires much more gas filled up each month. So basically we pay more for gas to emit the same amount of carbon into the air. Thanks government for cleverly bending us over the table once again. So buying an old car that emits more carbon makes no difference. I'd rather buy that car that runs souley on air (I think it's called the cAt or something like that), that sounds like it would do something.
Like my dad says all too often, "Always keep a bottle of lube, because everyone is out to fuck you in the ass, you might as well make it easier on yourself."