FOR 40-odd years now, as Barack Obama lamented on March 30th, American politicians have banged on endlessly about the evils of America's dependence on imported oil, without doing very much about it.

正如巴拉克·奥巴马在3月30日所感叹的那样，迄今40多年以来，美国政界就美利坚合众国对进口石油高依赖的危害性说了很多，但是做得却很少。