U.S. Marines of the 15th Expeditionary Unit (MEU) Fox Company "Raiders" sleep wearing respirators during a gas attack alert in an undisclosed location in the Iraqi desert on March 28, 2003.

For more than 15 years, the US federal government has slapped limits on greenhouse gas emissions based on a ... But now President Donald Trump has launched an attack on the government’s 2009 ...

"And as of today, there is not one member of the United States military who is in active duty in a combat zone, in any war zone ... to Syria's border came under attack by an Iranian-made drone.

The Russian Defense Ministry reported earlier that Kiev had used nine drones to carry out an attack on a compressor station in Russia’s southern Krasnodar Region in order to disrupt gas supplies ...

The first world war saw the first widespread combat use of modern chemical weapons ... Overall an estimated 90,000 people were killed by gas attacks, and a further 1.2 million injured, sometimes ...