Hydrogen Fuel Cells, Global Warming, and Humidity?

I agree that water can be considered to be a pollutant. If we add water to an arid area, we turn the ecosystem upside down. People think water help things grow, and make it more hospitable. That is true and thats the problem. If there is moer water in the desert, there are more predators that would kill of the animals that live in the desert. More water would mean more herbivores to eat the desert plants. The faster growing plants would out compete the slow growing desert plants. Plus California does not have the water to spare to make Hydrogen. Ever since I heard about Hydrogen fuel for automobiles, I was against it. Electric cars make more sense. TO make Hydrogen fuel according to current technology, you need to convert some sort of energy source into electricity. THen you need to convert electricity into making Hydrogen. You lose energy converting electricity into Hydrogen. The people supporting this try to mislead the public into thinking it's a new energy source. It is not. THere is no Hydrogen mine . We still need to use the old methods to make electricity to make the Hydrogen. Granted, putting up more wind turbine might help, and my least favorite , nuclear reactors. As for water being a greenhouse gas, thats disputed. Some think that clouds reflect light back to space while others think that clouds reflect heat back to earth. I doubt it would be significant, since cloud cover is more dependent on heat. Also another intersting note, Energy efficient engines like the ones that are advertising by GE, is actually create more greenhouse effect than energy wasting engines. The GE engine does not generate as much heat and the water vapors turn into clouds that causes the greenhouse effect. The energy wasting engines generate more heat and the water vapor totally evaporates.