At the World Economic Forum, President Trump's return to the White House overshadowed traditional talk on climate change, trade and development.

A speech by the U.N. chief, economic growth potential in places like China and Russia, the challenges of artificial intelligence and leaders from Spain to Malaysia are set to headline the agenda at the World Economic Forum’s annual event in Davos.

As The World Economic Forum in Davos, Switzerland unfolded over the last week, each day marked an important stride in the global business and political landscape.

Brent crude futures were down 90 cents, or 1.14%, at $78.1 a barrel by 11:40 a.m. EST (1640 GMT). U.S. West Texas Intermediate crude (WTI) fell $1.01, or 1.34%, to $74.43.

U.S. President Donald Trump drew pockets of laughter and a few moans with his blunt comments to an international audience while appearing by video link at the World Economic Forum meeting in Davos, Sw