In just over five years, the world will arrive at its first major checkpoint on climate action: a 2030 deadline to meet a series of green targets aimed at avoiding the most devastating impacts of global warming. These goals … are intended to put the global economy on a path to reducing the amount of greenhouse gases accumulating in the atmosphere. Yet … carbon dioxide emissions hit a new record last year. That means the world faces a steeper, far costlier and more disruptive journey to reach net zero by 2050. And that was before the re-election of Donald Trump. With a second term in the White House, Trump is unlikely to steer the world’s second-biggest polluter to decarbonize faster than the current pace. In fact, Trump has vowed to undo many of the nation’s expansive climate policies and withdraw from global cooperation. The consequences will extend far beyond the US.