Europe has similarly daft subsidy regimes with equally perverse consequences the German subsidy for solar energy, for instance, which has diverted the world's solar-cell production to sun-free Germany, thus raising the price in sunny countries where it might be usefully employed.

ECONOMIST: Climate change

Traditionally these are large pieces of polished metal, steered by electric motors to keep the sun's rays focused on the cell.

ECONOMIST: Monitor

When the sun goes down, the hydrogen powers a fuel cell that runs your home.

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