coal

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province, April 29, 2014. Workers at this mine in Choa Saidan Shah dig coal with pick axes, break it up and load it onto donkeys to be transported to the surface. Employed by private contractors, a team of four workers can dig about a ton of coal a day, for which they earn around $10 to be split between them. The coalmine is in the heart of Punjab, Pakistan's most populous and richest province, but the labourers mostly come from the poorer neighbouring region of Khyber Pakhtunkhwa. Picture taken April 29, 2014.

Sara Farid/Reuters

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province. Workers at the Choa Saidan Shah mine dig coal with pick axes, break it up and load it onto donkeys, to be transported to the surface

A worker levels the coal on a freight train in Taiyuan in northern China's Shanxi province.

AP

A worker levels the coal on a freight train in Taiyuan, in northern China’s Shanxi province

A worker carries coal in a basket at a coal wholesale market in Mumbai, India, on Tuesday, July 2, 2013. India, the world s third-largest coal consumer, imported 43 percent more of the fuel than a year ago on increased demand from power stations and steelmakers, according to shipping data, and is set to eclipse China as the top importer of power station coal by 2014.

Dhiraj Singh/Bloomberg

A worker carries coal in a basket to a wholesale market in Mumbai, India. The country, the world’s third-largest coal consumer, imported 43 per cent more fuel than a year ago due to increased demand from power stations and steelmakers, according to shipping data, and is set to eclipse China as the top importer of power station coal by 2014