ALICIA POWELL DIRECTOR Adam McKay has assembled an all-star cast brimming with Oscar winners to give a humorous warning about climate change in the new movie "Don't Look Up". In the Netflix film, Academy Award winners Jennifer Lawrence and Leonardo DiCaprio play two astronomers who set out to warn the world of an approaching comet set to destroy the planet. But the message falls on deaf ears, starting with Meryl Streep's President Janie Orlean. "I think the big trick is we want you to laugh ... The great thing about test screening the movie was right, left-wing were all laughing,"…