In fact, estimates by the International Energy Agency suggest that the most significant recoverable reserves of shale gas are in the US and China, not Europe. Moreover, even these estimates are really not much more than educated guesses, because only in the US have shale formations been subject to intense exploration over a period of decades.
事实上，国际能源署的估计表明，大部分可开采页岩气储量在美国和中国，而不是欧洲，此外，这一估计无非就是有点根据的猜测，因为几十年内只有美国的页岩气进行了密集开采。