Donald Trump put friends and foes on notice when he addressed the World Economic Forum on Thursday, making his return to the world stage.

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.

Groups working with businesses on climate action said they see no retreat from climate goals despite Donald Trump's pledge to end what he calls a "green scam."

The U.S. spends around 3 percent of economic output on defense{beacon} Defense &National Security Defense &National Security   The Big Story

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

U.S. President Trump is to speak to an international audience for the first time after returning into the White House with a speech and Q&A by video conference to the World Economic Forum’s annual event in Davos on Thursday.

Here are five economic forces that could shape the first year of Trump’s presidency: Whipping inflation is easier said than done.

The Washington Post brought its front row seat in Washington to the World Economic Forum this past week. Its slate of power programming, “From D.C. to Davos,” featured four days of dynamic conversations,

The World Economic Forum, colloquially called "Davos" after the location at which it's hosted in the Swiss mountains, is a yearly meeting of elites.

A new U.S. president’s promise to expand fossil fuels that is at odds with global ambitions to combat climate change will be a topic of discussion at the World Economic Forum.

Report TRUMP FIRST 100 DAYS © AP PhotoTrump takes ‘America First’ to the world stage PRESIDENT TRUMP TOOK HIS “AMERICA FIRST” DOCTRINE to the world

Leading business and political figures attending the World Economic Forum meeting in Davos, Switzerland, have discussed and debated topics such as technology, tariffs, climate change, Ukraine, Gaza and the global economy this week.