The three greenhouse gasses are Carbon dioxide (CO2), Methane(ch4) and Nitrous oxide(n2o) . Greenhouse gasses are transparent to radiation from the sun but blocks long wave radiation from leaving the Earths atmosphere. The effect traps radiation from the sun and warms the planets surface. More warming occurs than naturally. The reason they are greenhouse gasses is because they have three or more atoms and they capture outgoing infrared energy from Earth and it is warming the planet. They gasses can remain in the atmosphere for a few years up to thousands of years. One reason we have greenhouse gasses is because of human activitys, which one example is fossil fuels. These gasses absorb the infrared radiation. Solar energy is radiated back to the atmosphere and it is heat. Greenhouse gasses absorb the heat that makes it its way to though the atmosphere.