听力音频：

Questions 31-33

Choose the correct letter, A, B, or C.

31 Society cannot A find more coal and oil. B reduce waste CO2. C take CO2 from power stations.

32 Turning carbon dioxide into a solid A is slow but practical. B can be made faster. C cannot happen naturally.

33 Seawater A has lots of carbonic acid. B has closely connected types of life. C is highly acidic.

Questions 34-40

Complete the table.

Write NO MORE THAN TWO WORDS OR A NUMBER for each answer.

Three Problems of Geosequestration

Risk of leaks	Cost	34……………….. still not proven
Gas would become 35………………..	expensive, particularly the 36………………..	Require the plant to burn 37……………….. of its coal
↓	↓	↓
risk of widespread 38………………..	Price of electricity could 39………………..	release of more sulphur, ash, and 40………………..