Forty years ago, we almost stopped climate change. What happened? And more importantly, where does that leave us now? Author Nathaniel Rich has some answers.
In the 1960s, Pittsburgh's horrible air earned it the nickname ‘Hell with the lid off.' But a group of housewives, doctors and engineers with a knack for guerrilla marketing helped clear the air.
Journalist Beth Gardiner travels to places like China, India and Poland to examine the impacts of toxic air, and the possible solutions for fixing a global health crisis.