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THERE ARE five weeks left to the opening of the climate-change summit in Copenhagen. Virtually every national leader is expected to gather in the Danish capital in an attempt to hammer out a deal to bring unity to the battle against global warming. All that is required is an agreement to find a method to achieve one simple goal. Emissions of carbon dioxide from the planet's factories, power plants, cars, planes and homes must be made to peak in a few years so that by 2020, a substantial decline in the world's output of greenhouse gases will have begun.

Only then, say scientists, will it be possible to prevent global temperatures from rising by 2...