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Page added on June 24, 2010

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Natural gas, the green choice?

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Natural gas is regarded as a relatively environmentally friendly way of generating electricity. Gas burns cleanly without many of the problems associated with coal. Coal is a chemically complex substance. When it is is burnt, it releases oxides of sulphur (SOx) and nitrogen (NOx), traces of mercury, selenium and arsenic, as well as particulates, and a non-combustible slag remains after burning. Coal mining is also a dirty and dangerous job. Coal emits considerably more CO2 than natural gas per unit energy. However, natural gas (CH4) itself is a potent greenhouse gas, and its release to the atmosphere without being burnt can quickly compensate for the CO2 advantage against coal.

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