EU chief Ursula von der Leyen said the 27-nation bloc will stick to the landmark Paris climate accord, despite President Trump's decision to withdraw from the agreement.

Officials and business executives at the annual gathering in Switzerland said the fight against global climate change would continue with or without the United States.

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.