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| The United States produces more greenhouse gases than any country in the world, apart from China. |
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| The plan to curb emissions from fossil-fuelled power plants is the most ambitious measure proposed by President Obama in his efforts to tackle climate change. |
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| The details of the plan will be laid out by the Environmental Protection Agency. |
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| It will give broad flexibility to states to decide how to meet carbon reduction targets, whether by closing coal-fired power stations and switching to cleaner sources of energy, or by creating cap-and-trade schemes. |
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| Some US media are reporting that by 2030 the government wants a 30% reduction in carbon dioxide emissions. |
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| Business groups and Republicans fiercely oppose the new regulations, and say they're likely to drive up electricity prices. |
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| But for the president the measure is important for his environmental legacy and in order to show global leadership on climate change. |
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