The United States has reactivated sanctions against Iran that could trigger the collapse of the multilateral Iran nuclear deal.

Despite the sharp exchanges between the U.S. and Iranian presidents at the United Nations, new negotiations may not be so far-fetched as sanctions intensify against Tehran.

A recent study by noted climate scientists is particularly bad news for the planet’s most vulnerable regions, including the Arctic and small Pacific islands. 

Italy’s populist government has relished defying the European Union, and its latest showdown with Brussels could threaten the continent’s fragile recovery—and the global economy.

Last week’s mail bombs and synagogue attack have reignited a heated discussion of hate crimes and terrorism in the United States. Definitions matter in this debate.