NPR's Lynn Neary talks with Jacques Perrin, the director of the film Winged Migration, which tells the story of the seasonal migration of birds from a bird's eye view.
Analysis from Dartmouth College removed human bias — finding volcanic activity in what's now India produced enough toxic gas to end the reign of the dinosaurs long before a meteor struck Earth.
Around the country, health care workers continue to grapple with their industry's massive carbon footprint. In Pittsburgh, doctors formed Clinicians for Climate Action to address the problem.