Reinfeldt was President of the European Council from 1 July to 1 December 2009. The signing of the Treaty of Lisbon was Reinfeldt's role as President of the Council, which also occurred on 13 December 2009. Reinfeldt was also responsible in this role to put EU's efforts to get into a binding agreement at the United Nations Climate Change Conference in Copenhagen in 2009 but this did not succeed.