Without Greenhouse Gasses??? Hey we need it!!!

Without the greenhouse effect, life on Earth would not exist. The Sun emits radiation to the Earth. If we could imagine a flat surface at the top of the atmosphere, that radiation is about 340 watts per square metre (340 W/m^-2). Just over 100 W/m^-2 is reflected out again by atmospheric aerosols and clouds, and the Earth’s surface, leaving some 240 W/m^-2 that heats up the surface of the Earth. The system must be in balance—energy “in” must equal energy “out”—so the Earth needs to re-radiate this amount back into the atmosphere. But the amount actually re-radiated depends on the Earth’s surface temperature: the hotter the surface is the more it will emit radiation. The outgoing radiation takes the form of “long wave” infrared thermal radiation. If the system balanced “naturally”, then the Earth’s surface would have a temperature of about –19° C (-66° F) since at this temperature 240 W/m^-2 would be emitted. Obviously, something else must be happening because at such low average temperatures life would not exist. The Earth’s surface is very much warmer than this “natural” level (around 15° C/59° F) and hence far more radiation is emitted than the 240 W/m^-2. What happens is that a lot of the Earth’s re-radiation bounces back to the Earth’s surface because it gets absorbed mainly by water vapour and carbon dioxide (CO₂) in the atmosphere. Water vapour, CO₂, and a few other minor gases act like a “blanket”. The balance is secured as follows:
Incoming solar radiation: + 340 W m^-2 Reflected from clouds, the Earth’s surface, etc.: - 100 W m^-2 Net incoming radiation absorbed by the Earth = + 240 W m^-2

Outgoing radiation: - 420 W m^-2 Greenhouse effect: + 180 W m^-2 Net outgoing (thermal) radiation = - 240 W m^-2