He's insane. And I don't mean that figuratively, I truly think he's lost it. All of his life, his daddy Al Gore, Sr., told him that he was going to be President some day. He was groomed his entire life to become President. Sure, he became interested in environmental causes back in the '80's and '90s, but he didn't go as all out into this like he's done in the last eight years.
After losing the 2000 election he was immediately rendered irrelevant and a loser. At this point, I think his mind was, to paraphrase his first book "in the balance". He was so desperate to remain relevant and desperate for attention, that he went full bore into environmental causes and the BS sham of man-made global warming.
But what makes him look even more ridiculous now is that while preaching to the rest of us about "reducing our carbon footprint", he's living in a 10,000 sq ft, 20 room mansion that consumes more than 20 times the national average for an American home, flying all around the world in private jets, and driving around in gas-guzzling limos. He tries to "justify" this by telling us that he's heavily invested in alternative energy programs, and that he buys "carbon offsets", which is one of the biggest scams ever created. Funny, but you don't really hear it published much that one of the "carbon offset" industry's biggest shareholders is none other than Al Gore, Jr., himself. I thing that the FBI should investigate the whole carbon offset industry under the RICO statues, because it's one major racket!.
Basically Al Gore is nothing more than another aging celebrity Boomer/Hippie who is trying to relive the glory years of his youth by latching on to and reviving the pet causes of the '60's.