Edexcel Jun 2015 Paper 2 Q20

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20 Induced hydraulic fracturing, commonly known as fracking, which was developed in 1947, is a technique for extracting natural gas (mainly methane) from shale deposits. While natural gas is a much cleaner fuel than coal, it is difficult to carry out fracking without leakage. Because methane is a far more potent greenhouse gas than carbon dioxide, it has been calculated that leakage rates of around 2% are sufficient to increase global warming. (a) Suggest what is meant by natural gas is a much cleaner fuel than coal. (1)(b) Explain how greenhouse gases cause global warming. (2)(c) Suggest why methane is a far more potent greenhouse gas than carbon dioxide. (1)(Total for Question 20 = 4 marks) TOTAL FOR SECTION B = 39 MARKS *P44881A01724* 17 Turn over<br />

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