The revision of the EU ETS was negotiated by the Union's heads of state and government in Brussels on 11 December 2008, and the European Parliament approved the new regime at first reading on 17 December. One of the main elements of the new system, which will enter into force in 2013 and run until 2020, are the enlargement of the scheme to new sectors, such as the petrochemical, ammonia and aluminium sectors, to two new gases (nitrous oxide and perfluorocarbons), and to aviation as of 2012, so that around 50% of all EU emissions would be covered. Road transport and shipping remain excluded, although the latter is likely to be included at a later stage. Agriculture and forestry were also left out, due to difficulties related to measuring emissions from those sectors accurately. Additionally, the EU states also agreed to "use at least half" of revenues generated from the auctioning of allowances in the EU ETS to invest in low-carbon technologies.
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