When U.S. voters chose Donald Trump to be their president, they entrusted him among other things to handle what two months ago I characterized as the top three threats that currently require international cooperation: climate change, nuclear proliferation and terrorism. Expect the new president to sound a lot different on these issues than President Barack Obama. On terrorism and preventing the spread of nuclear weapons, the changes may be more rhetorical than real. On climate change, if the U.S. walks away from its leadership role, the consequences will be grave. As a candidate, Trump expressed strong views on each of […]