They make everything hotter
No.
China
China produces significantly more greenhouse gasses than the U.S. But, the U.S. is second.
Carbon MonoxideCarbon DioxideNitrogen OxidesSulfur dioxides
No, the greenhouse effect is the effect of certain gasses such as carbon dioxide and methane (called greenhouse gasses) trapping heat near earth's surface. There is a natural greenhouse effect that keeps earth from becoming too cold, but there is some concern that human actions may be putting extra greenhouse gasses into the air and causing average temperatures to rise.
Ozone, Methane, Water vapor.
fossil fuels
Humorous answer: greenhouse gasses Correct Answer: Carbon dioxide, just like when outside and not in a greenhouse.
Nature creates greenhouse gasses by having cows fart.
Neither type release greenhouse gasses
Mars does have very small amounts of greenhouse gasses, but not enough to help warm the planet.
There are 5 major greenhouse gasses: water vapour, carbon dioxide (also known as CO2), methane, nitrous oxide and ozone. Water vapour is the strongest greenhouse gas but it happens largely naturally (ie ocean water evaporates when the sun shines on it). The other four are largely anthropogenic (man-made) greenhouse gasses. See chart linked below for detailed information on greenhouse gasses (GHG's) and their contribution to the greenhouse effect.