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means the cumulative volume of carbon dioxide emissions permitted within a defined five-year period, as determined by the Secretary of State in accordance with the duties under sections 4(1)(a) and 8(1) of the climate change Act 2008 in order to keep global warming below the net zero target, and set at: (a) 2,544,000,000 tonnes of Carbon Dioxide Equivalent for the period of 2018–2022 under the carbon budgets Order 2009, SI 2009/1259, art 2(c) (b) 1,950,000,000 tonnes of Carbon Dioxide Equivalent for the period of 2023–2027 under the Carbon Budget Order 2011, SI 2011/1603, art 2(c), and (c) 1,725,000,000 tonnes of Carbon Dioxide Equivalent for the period of 2028–2032 under the Carbon Budget Order 2016, SI 2016/785, art 2(c).