The idea of spraying a haze of sun-dimming chemicals high above the Earth as a quick way to slow global warming faces so many obstacles that it may not be feasible, a leaked draft U.N. report says. The U.N. review of a planetary sunshade, mimicking how a big volcanic eruption can...

The Syrian regime said Wednesday that claims by the French and U.S. foreign ministers that it was still using chemical weapons were "lies". On Tuesday, U.S. Secretary of State Rex Tillerson said the Syrian government may still be using chemical weapons, following a suspected...

U.S. Secretary of State Rex Tillerson Tuesday said Russia bore responsibility for recent chemical attacks by the Syrian government, which Moscow backs in the country's civil war. "Only yesterday more than 20 civilians, most of them children, were victims of an apparent chlorine gas...

France announced Tuesday that it was sanctioning 25 people and companies over their links to Syria's chemical weapons program, as diplomats were set to meet in Paris to push for action against perpetrators of the deadly attacks. The list published in the government's official gazette...