I need to know how these alternate fuels compare and differ. Like which works better and stuff. please help me with this. I don't get any of it at all!
There could be hundreds of them, the question is, how many are practical and don't actually make the problem worse. Hydrogen being produced from water takes more energy than the car gets. In fact, this is true of every solution. The most efficient might be plants that convert solar energy to a chemical that can be used as fuel (biodiesel) or animals that eat the plants and then poop out some good fuel. They are still not giving as much energy as they absorb from the sun (this would be impossible) but they may be the most usable.
Short answer NO. but you really need an understanding of basic mechanics to understand why Hybrids are an add on or extra mechanism in a drive train that collects, stores and allows you to reuse mechanical energy produced by a vehicle's engine. Therefore HYBRIDS MERELY IMPROVE THE EFFICIENCY OF THE UNDERLYING ENGINE/DRIVE TRAIN -- they do not replace it. This includes engines operating on gasoline, diesel, CNG, hydrogen (not including fuel cells), propane or bio-diesel. (To understand hybrid technology think about adding an electric motor to a bicycle. you have both ways to power it. both by pedaling and by the electric motor. Further, if it is set up so that when you pedal you will both propel the bike AND charge the battery to run the electric motor later -- That is hybrid technology) Hydrogen Fuel Cell equipped cars produce electricity directly that is used to power electric motors to turn the wheels. It is basically an electric car -- with an on-board electric generator instead of batteries. It is usually a totally different type of propulsion system than what hybrid technology is used for. On the other hand: CNG, hydrogen, propane, and bio-diesel are substitutes for gasoline and diesel. e.g. petroleum products. Therefore (if you produce them right with appropriate technology that is green) you can save a lot of petroleum from being used.
a hybrid must have either CNG, propane, gasoline, diesel, or other fuels, that's by definition. There is no such thing as an all electric (or fuel cell) drive train. A hybrid gets it efficiency increase from two fronts: 1) regenerative braking where the energy stopping a car is saved (versus heating up brake drums) and 2) the internal combustion engine shuts off when not need, like waits at stop lights. If you never touched your brakes, a hybrids wastes huge amounts of energy carrying around batteries and motors (try carrying an unneeded car battery while you walk). If you only brake or slow down once in a while (typical hi way driving) then the hybrid still wastes more than it gains. The place where hybrids do beat and beat nonhybids is in driving from stop light to stop light situations.
Any infernal combustion engine (CNG, propane or biodiesel, will have improved efficiency when connected to an electric motor or hybrid system the electric motor is much more efficient for providing motive force (torque) and for recapturing energy when slowing down (regenerative braking. most efficient is an electric car without the complexity of any infernal combustion. Fuel cells are just an expensive type of battery, but they are more inefficient than Li-ion batteries, because it is difficult to generate the hydrogen and distribute it without causing more pollution and using fossil fuel
