In a Friday appearance on HBO’s “Real Time,” Billy Crystal said he was worried about the world his children and grandchildren will be left to live in.

“Are we going to have enough fish, are we going to have enough air, are we going to have enough water, are we going to have people who believe in science so we can maybe turn this around?” Crystal asked. “What kind of world am I leaving them — that’s what, at this age, I think about more than anything.”

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