Sixteen biographies of extraordinary people - ranging from Sebastiao Salgado to Bjork and Greta Thunberg - who came of age fighting climate change. Together they show us that regardless of culture, class, or profession it is never too early or late to find your way to improve the world our children will inhabit. The stakes couldn't be higher: 'Our house is on fire,' as Greta Thunberg rightly said.