Greenhouse gases are the cause of Greenhouse effect.The greenhouse gases which include CO2, Methane etc. trap the heat in the Earth's atmosphere and don't allow it to escape.
The weapon is fitted with a Leupold Mark 4. The rifle is also similar in appearance to the TAC-338 rifle that Kyle used in real life. McMillan TAC-338A sniper rifle with Harris bipod, Leupold Mark 4 scope, and AN/PVS-22 Universal Night Sight - .338 Lapua Magnum. Kyle taking aim with the rifle. Right side of the rifle.
Bradley Cooper as Chris Kyle in American Sniper. Photo illustration by Slate. Photo courtesy of Warner Bros. Pictures. On Feb. 2, 2013, former Navy SEAL Chris Kyle was killed at a shooting range near Chalk Mountain, Texas, while attempting to help fellow veteran Eddie Ray Routh. He had gained notoriety during the Iraq warâwith 160 confirmed kills out of a possible 255, Kyle remains the deadliest sniper in U.S. military history.