Had Al Gore been president on 9/11, I truly believe he'd have used the unbelievable unity we had in the wake of that tragedy to build support for a massive, New Deal style investment in renewable energy - wind, solar, infrastructure... It would have done three things: 1) Freed us from our reliance on middle east oil & strengthened our hand in dealing with terrorism; 2) Created millions of jobs; 3) Helped with climate change.