About 5.5 million people around the world die prematurely every year from breathing polluted air, and the majority of those deaths are occurring in China and India, where factories and coal-fired power plants are fueling economic growth, according to a report released Friday.
Men now outnumber women (2013) on the planet by 60 million, the highest ever recorded. Preference for sons in India and China is driving the trend, but those two countries are not the only ones struggling with an imbalanced population. Here's a look at five decades of data: