Millions of climate strikers all across the world took to the street on Sept 20th. And there’s another strike scheduled on Sept 27th, as well. Today on Front Burner, we talk to Naomi Klein, author of the new book “On Fire: The Burning Case for the Green New Deal” about Greta Thunberg, the Green New Deal, and why she thinks mass mobilization around climate change may be the only thing that can help us avoid global warming’s most devastating effects: “If you don’t believe in social movements, and if they make you kind of queasy and they seem kind of messy, then you should feel really pessimistic, because it’s actually our only hope.”