Water worries: The drying of the West

Economist: STANDING on the Hoover Dam and looking upstream at Lake Mead, America’s largest reservoir, the visitor notices a wide, white band ringing the cliffs. Nicknamed “the bathtub ring”, this discolouration comes from minerals that were once deposited on the volcanic rock by the Colorado River and have become visible as its level has dropped. It is one sign of a water crisis that threatens America’s south-west. Other reminders abound. Farther upstream there are dry docks, jutting out ominously into desert,......

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