There are dozens of other possible feedback mechanisms . Higher temperatures will fuel condensation and increase cloudiness, which may actually damp down global warming. Others, like the albedo effect, will do the opposite. The albedo effect is the amount of solar energy reflected by surface. As northern ice and snow melts and the darker sea and land pokes through, more heat will be absorbed, adding inexorably to the global temperature increase.
Scientists continue to tinker away with their computer models, but the bare-bones facts are clear.
Even if we were to magically stop all greenhouse-gas emissions tomorrow the impact on global climate would continue for decades. Delay, any delay, will simply make the problem worse. The fact is that some of us are doing quite well the way things are. We in the developed world have built our prosperity on 150 years of cheap fossil fuels. Gas heats our water and warms our homes and factories.