Coalminers prepare to fill trolleys with more coal in a mine in Qianjiangping village in the south-west part of China November 4, 2007. China, the world's largest producer and consumer of coal, has seen its demand for the dirty hydrocarbon nearly double in the past five years. Coal accounts for about 70 percent of primary energy consumption by the world's fourth-largest economy. REUTERS/David Gray (CHINA)
REUTERS/DAVID GRAY