I want to buy a hybrid prius
A hybrid vehical is great because it uses two different kinds of power.
I want one for environmental reasons
That is is very forward thinking of you. The electric generator that powers the electric motor is much better for the environment.
My thoughts exactly trying to not damage the environment any more than I have to but still have to have a vehicle, 
Other hybrid vehicle power sources include: electric bicycles, mopeds, and even small scooters are a simple type of hybrid. 
That is interesting what else can you tell me about hybrids? always trying to learn more about them\
Besides electric and gas, there is another way hybrid vehicles can store energy. They are hydrolic hybrids that store energy through pressurized fluid.