Al Gore — climate change activist, one-time VP, and former next president of the United States — has endorsed Hillary Clinton for president. He made the announcement Monday on Twitter.

Gore joins a long list of environmentalists in endorsing Clinton, a woman who both believes that climate change exists and has promised to do something about it. Republican nominee Donald Trump, on the other hand, has varyingly referred to climate change as a “hoax,” “mythical,” “nonexistent,” a “con job,” and — a personal favorite — “bullshit.”