Quote Originally Posted by bsnub View Post
^ Regardless the more CO2 in the atmosphere the more the earth warms.
That's not strictly true... the safer statement would be "the more CO2 in the atmosphere, the more the earth's climate changes".
It certainly isn't even or fixed, like stacking blankets, it's quite dynamic, and without definining the window you're looking at with this statement, it's a bit meaningless... do you suppose the CO2 just sits there in the sky accumulating until the Earth turns into Venus?

Here's an accessible-to-all primer:
Carbon dioxide causes about 20 percent of Earth’s greenhouse effect; water vapor accounts for about 50 percent; and clouds account for 25 percent. The rest is caused by small particles (aerosols) and minor greenhouse gases like methane.
Water vapor concentrations in the air are controlled by Earth’s temperature. Warmer temperatures evaporate more water from the oceans, expand air masses, and lead to higher humidity. Cooling causes water vapor to condense and fall out as rain, sleet, or snow.
Carbon dioxide, on the other hand, remains a gas at a wider range of atmospheric temperatures than water. Carbon dioxide molecules provide the initial greenhouse heating needed to maintain water vapor concentrations. When carbon dioxide concentrations drop, Earth cools, some water vapor falls out of the atmosphere, and the greenhouse warming caused by water vapor drops. Likewise, when carbon dioxide concentrations rise, air temperatures go up, and more water vapor evaporates into the atmosphere—which then amplifies greenhouse heating.
So while carbon dioxide contributes less to the overall greenhouse effect than water vapor, scientists have found that carbon dioxide is the gas that sets the temperature. Carbon dioxide controls the amount of water vapor in the atmosphere and thus the size of the greenhouse effect.
The Carbon Cycle : Feature Articles