When Rebekka Karijord and Jon Ekstrand were asked to compose the original score for the new Greta Thunberg documentary, I Am Greta, they knew they had to somehow create a musical language for a true force of nature. We discuss working on the film sustainably, their thoughts on the climate crisis, Rebekka's other life as a singer-songwriter, and Jon's upcoming Marvel movie, Morbius (starring Jared Leto and Matt Smith).