He wasn't successful, because he was inaccurate and misleading. He got publicity, that's all (mainly from climate change skeptics). Maybe he wants publicity for being wrong (and to sell books about his fiction where he demonstrates that he's wrong) -- that's his prerogative.
"He wasn't successful, because he was inaccurate and misleading. He got publicity, that's all ... Maybe he wants publicity for being wrong."
Perfect description of Al Gore!