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Paramount Pictures, Melinda Sue Gordon, Associated Press
This photo released by Paramount Pictures shows, Matthew McConaughey, left, and Anne Hathaway, in a scene from the film, '"Interstellar," from Paramount Pictures and Warner Brothers Pictures, in association with Legendary Pictures.

ST. PETERSBURG, Fla. — There's a giant, inflatable whale sitting in a Florida park this week, and it's more than just a public art piece.

The blue whale signals the arrival of the Blue Ocean Film Festival — one of the biggest environmental documentary events in the world — and also the rise of the emerging genre of cli-fi movies.

These movies aren't necessarily documentaries. The just-released "Interstellar" is considered part of the cli-fi genre.

Short for "climate fiction," the genre has environmental issues at its core. Many novels are set in a dystopian world where climate change has wreaked havoc on the planet.

There's even an online film festival called The Cliffies, which hands out awards to climate change movies.