But the most crucial – and almost always overlooked – point about fracking is that shale gas, like all hydrocarbons, can be used only once. The real issue is thus not whether shale gas should be developed in Europe, but when it should be used: today or tomorrow.
但关于液压致裂法的最关键（通常也总是被忽略）的一个要点是页岩气和其他碳氢化合物一样，都是不可再生的。因此，真正的问题不在于欧洲应不应该开采页岩气，而在于什么时候开采：现在还是将来。