The future is black
STAB a finger at the middle of a map of India and you will hit Nagpur. Some 20 miles (32 kilometres) north-west of the city is a sloping tunnel bored into the rock. Ride two miles down into the gloom, hanging from a wire, and after a torch-lit hike past underground streams and conveyor belts you arrive at a black wall. Sweating men are rigging it with tubes of explosives and wire detonators. Soon they will blast it apart, and down should tumble tonnes of India's most important commodity: coal.
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