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In page Low-carbon economy:

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In the United Kingdom, the Climate Change Act 2008 outlining a framework for the transition to a low-carbon economy became law on November 26, 2008. This legislation requires an 80% cut in the UK's carbon emissions by 2050 (compared to 1990 levels), with an intermediate target of between 26% and 32% by 2020.[1] Thus, the UK became the first country to set such a long-range and significant carbon reduction target into law.