China Railway High-speed (CRH) trains, operated by China Railway Corp., sit in a train yard shrouded in haze on the outskirts of Shanghai.

China Railway High-speed (CRH) trains, operated by China Railway Corp., sit in a train yard shrouded in haze on the outskirts of Shanghai.

The skyline seen from an airplane through heavy smog.

China Railway High-speed (CRH) trains, operated by China Railway Corp., sit in a train yard shrouded in haze on the outskirts of Shanghai.

The skyline seen from an airplane through heavy smog.

China Railway High-speed (CRH) trains, operated by China Railway Corp., sit in a train yard shrouded in haze on the outskirts of Shanghai.

A couple walking near housing at the Chaikina coal mine where Ukrainian coal miners went on strike seeking political change at the Kremlin and contributing to the dissolution of the Soviet Union.

A couple walking near an area marked with coal mine tailings in the Donbas region.

A man stands on the banks of Yangtze River where a thick haze shrouds the Tianxingzhou Yangtze River Bridge.

A heavy haze shrouds the Tianxingzhou Yangtze River Bridge.

A tractor tyre lies beside an irrigation drain which dischargers into the Tobari Bay. The bay has pollution and silting problems due to the discharge from 267 miles of agricultural drains that empty i...

After returning to the dock in Paredon Colorado, Jose Antonio Salido (38, right) and his father, Jose Maria Salido (64, left), collect fish they've caught in Tobari Bay from their nets. According to S...

After returning to the dock in Paredon Colorado, Jose Antonio Salido (38, right) and his father, Jose Maria Salido (64, left), collect fish they've caught in Tobari Bay from their nets. According to S...

Ears of wheat growing in a field belonging to Luis Arturo Amaya (48). As a way to reduce emissions and minimise pollution, Aldama limits his use of fertiliser with the help of a sensor that analyses t...

Workers at the newly built Arc de Triomphe in Egypt's New Administrative Capital. Following persistent problems of overpopulation, pollution and traffic congestion, the construction of a giant new sa...