On 13 October 2006, he was elected to be the eighth Secretary-General by the United Nations General Assembly. On 1 January 2007, he succeeded Kofi Annan. Ban struggled in his first month to adjust to the culture of the United Nations, but quickly found his bearings and passed several major reforms on peacekeeping and UN employment practices. Diplomatically, Ban has taken particularly strong views on global warming, pressing the issue repeatedly with U.S. President George W. Bush, and on the Darfur conflict, where he helped persuade Sudanese president Omar al-Bashir to allow peacekeeping troops to enter Sudan.