31 What does President Obama propose to curb the greenhouse gases?
(A) To stop the leaking of methane.
(B) To make more use of natural gas.
(C) To burn more coals.
(D) To take advantage of fossil fuels.

Climate scientists vigorously有力 debate談論 about how bad global warming will get, how quickly, and how to combat it. One fight involves how much effort to put into stopping leaks洩漏 of methane gas甲烷 into the atmosphere.

Some academics complain that President Obama’s plan to make greater use of natural gas, which consists由…組成 mostly of methane, will lock America into a supposed可能 solution解決 to climate change that will be worse than burning coal.

Is that claim plausible合理? The basic scientific facts are clear. The most important greenhouse gas that humans are spewing噴出 into the atmosphere is carbon dioxide二氧化碳, which comes from burning fossil fuels礦物燃料.