This week we meet one of the most influential people on climate change you've probably never heard of.Mark Campanale is Founder & Executive Director of Carbon Tracker, a think tank whose ground-breaking Unburnable Carbon report made the entire financial world sit up and go "oh, lordy, perhaps fossil fuels aren't so great after all".It also prompted Bill McKibben to write his epic Global Warming's Terrifying New Math article in Rolling Stone magazine, which quickly became one of the most downloaded climate pieces of all time and spawned an entire new activist movement.We quiz Mark on how all this came to be and what on earth a carbon bubble really is.Sustainababble is your friendly environment podcast, out weekly. Theme music by the legendary Dicky Moore – @dickymoo. Sustainababble logo by the splendid Arthur Stovell.Available on iTunes, Acast, Soundcloud & all those types of things, or at sustainababble.fish. Visit us at @thebabblewagon and at Facebook.com/sustainababble. Email us at [email protected].