Great Wall of China, an extensive bulwark erected in ancient China, one of the largest building-construction projects ever undertaken. It actually consists of numerous walls many of them parallel to each other built over some two millennia across northern China and southern Mongolia.
China wants to reap the benefits of a shale gas revolution similar to the one in the United States, but there are many obstacles to this happening, experts say.In the first half of 2013, fifty-six shale gas wells were in the exploratory phase in the country, but only twenty-four were producing gas. Only six wells all dug by either China Petrochemical Corp. (Sinopec Group) or