由于供给的增加，美国天然气价格自2008年以来下跌了三分之二，并且将维持显著低于世界其他地区的水平直到（至少）2020年。
As a result of increasing supplies, US natural-gas prices have declined by two-thirds since 2008 and are likely to remain significantly lower than prices in the rest of the world at least through 2020.