Jan. 21 (UPI) -- The World Economic Forum in Davos, Switzerland, was dominated Tuesday by the arrival of a second Trump administration amid ominous warnings over the new president's decision to pull the United States out of the Paris climate agreement, for a second time, and potential trade wars. European Commission President Ursula von der Leyen warned in a speech that the world had entered a "new era of harsh geostrategic competition" that would see nations resort ever more frequently to the