President Barack Obama today announced a broad attack on climate change. His hope is to reduce greenhouse-gas emissions, and he aims at every target imaginable -- every target within his authority, that is. Included in his plan are solar and wind projects on U.S. public lands, new energy-efficiency standards and fuel-economy requirements, and greater limits on greenhouse-gas emissions of all kinds. Unfortunately, he had to leave out any strong action Congress could take. That includes a meaningful tax on carbon, the kind of to bring greenhouse-gas levels 80 percent to 95 percent lower than they were in 1990 and thus keep temperatures from rising more than 2 degrees Celsius. In 2009, Congress...
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