Greta Thunberg’s father said in a new interview that the 16-year-old climate activist from Sweden has become much happier after taking up the environmental cause — but that he worries about all the “hate” she faces. Actor-turned-producer Svante Thunberg, 50, told the BBC that he and Greta’s mom, opera singer Malena Ernman, at first objected to their shy daughter becoming an eco-warrior. “Obviously, we thought it was a bad idea, putting herself out there with all the hate on social media,” he said about Greta, who was diagnosed with Asperger’s syndrome — a form of autism — at age 12.