The Unabomber believes in global warming. Therefore, since the Unabomber is a bad person, the theory of global warming must be false.
Lots of other fun facts follow from this line of reasoning. For example, did you know that God does not exist? After all, Hitler believed in God.
Also, God does exist, because Stalin did not believe in God.
Mussolini supported the idea of capitalism, so capitalism is a bankrupt philosophy.
It is a known fact that mass-murderer Jeffrey Dahmer believed that birds could fly. Therefore, birds cannot fly.
Also, reason is dead, because even stupid people can see that the logic in the Heartland Institute’s billboard is woefully flawed.