Pollution deadlier than war, disaster, hunger

Indian soldiers walk amidst morning smog a day after Diwali festival, in New Delhi, India, Friday. Photo: Manish Swarup / AP

"Pollution kills at least nine million people and costs trillions of dollars every year, according to the most comprehensive global analysis to date, which warns the crisis 'threatens the continuing survival of human societies,'" The Guardian writes of the study, released by The Lancet medical journal:

Key statistic: "Toxic air, water, soils and workplaces are responsible for the diseases that kill one in every six people around the world."