Obama returns to Washington from G20

U.S. President Barack Obama arrived at Joint Base Andrews in Maryland on Sunday from Brisbane, Australia where he attended the G20 summit.

During the meeting, Obama pledged up to $3 billion to the United Nation's Green Climate Fund (GCF) which helps poor nations cope with global warming.

G20 leaders put a spotlight on climate change despite efforts by host Australia to focus more narrowly on economic growth.

Last week, the United States and China set goals for curbing climate change.