In fact, one film, called “Revolution,” is all about activists for the environment.

Filmmaker Rob Stewart says a good many of them are under 25.

“We’ve got, you know, we’ve got kids on our side. And they’re the most powerful, most active, most energetic group on the planet, and it’s their future that’s at stake. So I think, for sure, I’m hopeful.”

A few years ago, Mr. Stewart made a movie about saving sharks. But now he says it’s not just sharks we need to save. It’s us.

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