National Public Radio: Air pollution has become the world's largest environmental risk, killing an estimated 7 million people in 2012, the World Health Organization says.
That means about 1 out of every 8 deaths in the world each year is due to air pollution. And half of those deaths are caused by household stoves, according to the WHO report published Tuesday.
The fumes from stoves that burn coal, wood, dung and leftover crop residues as primary cooking fuels contribute to heart disease, stroke, lung cancer and...