In a free-wheeling speech to world leaders at the World Economic Forum in Davos, Switzerland, President Trump made a series of contested claims. Trump touched on his desire to obtain Greenland from Denmark - which he referred to as a "small ask", America's contribution to Nato, and wind energy in China. His address - which lasted for more than an hour - contained a number of false assertions which BBC Verify has been looking at. For weeks, Trump has spoken about his desire to acquire Greenland,