The inclusion of aviation emissions into the EU emissions trading scheme (ETS) sees airlines paying for the green house gases emitted during flights. Starting from the 1st January 2012 all flights taking off from and landing at airports in the European Union have to surrender emissions permits to match volume of emissions produced during the flight. In 2012 airlines will be given 85% of their allowances for free, falling to 82% annually from 2013 to 2020. The UK is a key European aviation hub and all airlines landing and taking off here will be affected by the new environmental legislation.