What should I say to challenge my history teachers claim that global warming is fake?

My history teacher does not beloved in global warming or Evolution, well he is a coach he just shows movies to his cles. I already had a bio teacher who said the same thing but he was not so vocal about it. His only reason was that it was 20 degrees last week and that is cold for north Carolina, and it's just al gores way to get rich. I could just say well what about the glaciers melting but I want something really convincing. It would be nice if you could add sources. A list of organizations (un, pentagon etc) and percent of scientist who belive in it would be cool.