[cogitator]

I would still like one of those guys to explain to me why the earth warmed up 20,000 years ago when the only pollution created by man was camp fires and the occasional fart.

Because the Earth is subject to astronomical cycles which vary the amount of solar insolation it receives, which in turn affects the global radiative balance, which in turn affects the fluxes between sources and sinks of CO2 in the atmosphere and oceans, which in turn affects the atmospheric concentration of CO2, which in turn affects the temperature of the Earth.

For more on this, see the links provided in post 35 of the thread linked below.

Massive air pollution casts Asian haze over global climate

[matchwood]

And there is this that makes sense to me:

http://www.geocities.com/Athens/Academy/6040/flood15.htm