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.
It was a sunny, unseasonably warm day in North Texas. Chris Kyle, a 38-year-old former Navy SEAL and author of the best-selling autobiography American Sniper, stepped out of the cab and began walking up the gravel driveway. Eddie Ray Routh, 25, tall and bearded, appeared from the back of his house.