The US government has given half a billion dollars to the UN’s Green Climate Fund, just three days before Donald Trump takes office. Barack Obama’s outgoing administration announced the contribution of $500m (£406m; €468m) on Tuesday, bringing the total funds to date to $1bn. Mr Obama pledged in 2014 to give $3bn to help tackle the effects of climate change in the poorest countries. Mr Trump has previously called global warming a hoax. The president-elect has also threatened to pull the US out of the Paris accord – a global agreement on curbing greenhouse gas emissions – and America’s commitment...