As clean fossil energy, natural gas occupies 23.7 percent of global primary energy consumption. The proportion of natural gas consumption is relatively low in China, 6.2 percent in 2016. The United States and the UK are typical natural gas consuming powers. The natural gas industry has experienced three stages in these two countries – starting stage, development stage and mature stage. As a result, they have perfect market competitive systems and legal supervision systems. The two countries are different in...