Grist: Thirty states have renewable electricity standards requiring utilities to generate a percentage of their power from clean sources. But the U.S. as a whole does not.
Instead, the federal government has tried to boost domestic renewable energy production through inducements such as tax credits and business loan guarantees. But as any advocate of cap-and-trade can tell you, the most efficient way to shift the behavior of an industry is to simply require your desired outcome and let the magic of the...