Rhys,
Although I agree with your analysis overall there are a couple of things I would like to comment on if I may.
Hydrogen is not an energy source, as there is little or no "free" hydrogen and it takes more energy to produce it than you get back from it. It is basically a way of storing and transporting energy, and not at present a very efficient one. Hybrids are more practical at present, but there are cheaper ways of getting gas mileage up - like building basic smaller cars without all the gadgets people insist on today.
As far as there being no "free" hydrogen...there really is not anything that is free. Even the coal and oil we use now is not free and it is taking from place in the world, refining, and putting to use in a different place in the world. If I keep taking rocks from the bottom of the stream and put them somewhere else then in the long run I am affecting that stream. We can get the hydrogen and refine it from water, the air, and many other sources.
And hydrogen in the fuel cell technology is actually using parts of hydrogen as the energy. An H
2 molecule is broken up into it's protons and electrons. The electrons are used for electricity. Then they come back and join with the protons as well as oxygen and produce water as a byproduct, along with heat which can also be used as an energy source. Although your statment is true that hydrogen is a carrier in the case of fuel cells it is the source of energy.
As far as it's efficiency... Current fuel cell techs are rated with efficiency ratings of 80% or more (40-60% being electricity). Current internal combustion engines set at ratings of about 40%. So with current technology the fuel cell is twice as efficient.
The biggest hurdles to overcome with H
2 fuel cells is cost and durability. Right now it is to cost prohibitive for the consumer to convert as far as cost per mile/gallon....we may be paying $3 per gallon for gas now...but it could easily be in the range of $12 per gallon of hydrogen for the cell sort of thing. And durability in that getting the cells to last longer before needing to be replaced or refilled. Basically they are too cumbersome to use in a car for what the average person would use their vehicle for. Fuel cells are currently where electric cars were 20 years ago...cute and interesting too look at...but when you wondered if it would take you across state without having to stop and plug in for 8 hours it would not.
Wind is being blocked locally by the NIMBYs who don't want to look at them, not by real environmentalists. But nobody has researched the long term effects of wind power, either. What effect will taking all that energy out of the atmosphere have? That may sound silly, but nobody in the early days of automobiles foresaw the environmental problems caused by the sheer numbers of them on the roads today.
hmmmm. Although I can almost understand this it just does not quite mesh. Let me ask this... If everyone in the world were put a solar panel on the roof of their house would it have an impact on the environment? No. But if we were to take huge open fields and cover them completely with solar panels all over the world then possibly (and I am not just talking about because we have killed the grass and weeds and trees and took out habitats and such), but without the sun's heat getting to the ground and warming it then could there be a cooling effect going on of the earth....we could have global cooling instead of warming. But the sheer amount of ground coverage to cause that sort of thing would be so massive that it is not feasible. The same is applied to wind power. The amount of energy that is removed by one turbine, from the wind is so nominal that it would take such a huge amount of them in one area to cause any sort of environmental impact. You can have alot of water wheel mills on the river before you even notice any sort of slow down of the water on the river.
Nuclear is safer than it used to be, but nobody has solved the waste storage problem yet, either. The stuff is deadly far longer than any government or civilization has survived in world history, so who is going to maintain the storage facilities and prevent leakage after the US is gone?
I agree that waste disposal is the problem we face today. And personally I say we launch it towards the sun. Load up the shuttle with a some containers and fire away on the next mission.