Nuclear. Fusion that is :P
Only a matter of time.
Oil , because not only is it used to make fuel, but it is necessary to make medicine, plastic, fertilizers, and computers. Let me know when you can make any of these products with wind power, solar polar, or nuclear power.
Nuclear, it's dangers are highly exaggerated.
none of the above - wind, geothermal, and solar.
Can I take a third option and say wind?