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Copenhagen wants to be the world’s first CO2-neutral city by 2025. But this initiative, however wonderful it sounds, is little more than a costly vanity project.

After all, the whole accounting exercise works only if others are still using coal and gas that Copenhagen’s unpredictable wind power can replace. If the city's unrealistic assumptions fall short, the financial losses for its inhabitants will be substantial.

Environmental protesters and politicians around the world are calling for countries to become carbon neutral by 2050, if not sooner. These proposals get a lot of attention, but they would incur far higher costs than almost any electorate is willing to pay.

For the well-off in both rich and poor countries around the world, lives are enriched by plentiful access to energy that provides light, fresh food, and clean water, and that powers technology and allows the ability to control the temperature.