The movie doesn't want to put Gore back on stage in a tweed jacket and a box of index cards, but that's where he's most like himself — professorial, earnest, excited about his syllabus and facing a room of eager pupils (the movie is heavy on supportive reaction shots). Gore obviously still loves his lectures on the economics of renewable energy — its cost relative to carbon-based fuels, the technological breakthroughs that continue to bring prices down.