Leonardo DiCaprio told Charlie Rose in an interview Thursday that climate change is “the biggest problem that mankind has ever had to face,” ahead of the international refugee crises being fueled by the deadly rise of the Islamic State. “It is the most existential human crisis that the world has ever known, in my opinion,” DiCaprio said.

Fresh from filming The Revenant, DiCaprio and the film’s director Alejandro Iñárritu recounted how they experienced the devastating affects of climate change on location in Argentina in the nine months that it took to make the movie.

DiCaprio’s comments in the video above echo similar statements he made last December when he claimed that “We were in Calgary and the locals were saying, ‘This has never happened in our province, ever.’ We would come and there would be eight feet of snow, and then all of a sudden a warm gust of wind would come.” FULL REPORT