The mixed fortunes of a fuel

IN A high-tech world, dirty black lumps of coal might seem like an anachronism. Yet coal is far from a thing of the past. However whizzy your iPad, your wall-mounted television or your electric car, the chances are that it is powered by the stuff. Coal-fired power stations provide two-fifths of the world’s electricity, and there are ever more of them. In the doubling of the world’s electricity production over the past decade, two-thirds of the increase came from coal. At these rates, coal will vie with oil as the world’s largest source of primary energy within five years. As recently as 2001, it was not much more than half as important as oil (see chart).

The main factor has been the unslakable thirst for energy in China, which in 2011 overtook America as the world’s biggest electricity producer. In 2001, according to the International Energy Agency, a club of rich nations, Chinese coal demand was about 600m tonnes of oil...