Washington Post: Republican U.S. presidential candidate Ted Cruz gestures over at rival candidate Donald Trump (L) at the U.S. Republican presidential candidates debate in Detroit, Michigan, March 3, 2016. REUTERS/Jim Young
In late March, when the United States and China jointly declared that theyd be moving to immediately sign and then join the Paris climate agreement as early as possible this year, it was seen as the latest show of joint leadership by the two largest emitters.
But theres another possible...