Ok... ignore the coal fired power plants, the coal fired cement plants, the natural gas fired power plants, natural gas fired glass plants, all the natural gas and fuel oil burned in home heating, all the carbon fuel burned everywhere except in cars...
Take the total number of cars in use, multiply that by 1/2 the cubic inch displacement (assuming 4 cycle engines) of their engines, multiply that by the average RPM of said engines, multiply that by the average number of minutes said engines are run daily, multiply that by 365, and tell me how many hundreds of thousands of cubic miles of air is run through JUST CAR ENGINES ??
Oh yes, that water vapor from the fuel cells... condenses very nicely back to water once you cool it a bit.
Yes, water vapor is a greenhouse substance, clouds do hold the heat in. More clouds, more rain in some areas. More heat in the oceans, more water vapor, more clouds... Big cycle... There is also a very very long carbon cycle of which all living things are part of. We are burning acient forests and animal life long burried. And that is not a part of the balanced process.
To say that we are not capable of causing climatic change? Have you ever wondered why it so often seems to rain just in time for the weekend? Look at historical data on when it rains most often if you want a little surprise.
Link just for reference: 1998 article
http://www.scienceagogo.com/news/199...runc_sys.shtml
Steve