Why haven't we achieved that renewable Hydrogen Economy? Many of the component technologies exist, but no one has yet put them together in quite the right way. So what I present here takes a little imagination, but not much. Renewable energy can usually be generated in relatively smaller amounts and higher cost per kilowatt-hour using solar & wind compared to fossil fuels. As such our current energy-intensive means of transportation is non-renewable and inevitably doomed. But that does not mean that we will go back to riding horses. There are many, many technologies that will survive and be used as long as mankind lives on the earth. A car that uses renewable energy would have to use miniscule amounts of fuel, such as hydrogen, to carry the rider over long distances. It would have to use minimal fuel because the solar modules or wind turbines used to electrolyze water into hydrogen would be prohibitively expensive if cars consumed as much energy as they do today. Smaller, lighter, slower vehicles get far superior fuel economy. As proof I offer the following gasoline-powered vehicle as an example of super efficiency... Hybrid Recumbant Vehicle: Fuel economy = 200+ mpg Range = 250 miles Cargo capacity = 150 kg maximum Empty weight = 40 kg Propulsion = hybrid pedal- and gas engine-power Top speed = 30 miles/hr Options: 2-seater version available <img src=http://www.bikemotor.com/images/bikeeat.jpg> The idea would be to get a natural gas, or hydrogen engine conversion and compressed gas fuel tank. Then add some aesthetic perks! <img src=http://www.windcheetah.co.uk/MEDIA/Gt.jpg> <img src=http://www.windcheetah.co.uk/MEDIA/bobsbits.jpg> Call it the "New Hotness"... All it's missing is a lightweight fully-enveloping plastic enclosure to protect from rain, snow or spray from the road. But it's too slow, you say? Well my place of work is a lot less than 30 miles from where I live in downtown Toronto, and yet it takes a full hour to get there by subway/bus. So 30 mph might not be so bad. You can cover a lot of distance at that speed. Next, outfit your garage with a hydrogen refueling system for your recumbant vehicle - made by Fuelmaker Corporation, right here in Toronto! http://www.fuelmaker.com/Products/HydrogenRefueling/ Hook up your solar modules, and voila! You've got renewable-energy transportation! So the big question is, where in my city can I get a recumbant retrofitted with an engine?