engine

And Bio-Fuel – Will things ever change? What if trains, planes, and automobiles all were powered simply by the air through which they move? What if their exhaust and byproducts helped the environment? And what if greenhouse gas emissions could be sustainably offset by a charcoal-like substance made from organic materials? All these things may in our future.

An energy-efficient, self-propelling mechanism already exists in nature: the salp, a smallish, barrel-shaped organism that resembles a kind of streamlined jellyfish, gets everything it needs from the ocean waters to feed and propel itself. And scientists believe its waste material may actually help remove carbon dioxide (CO2) from the upper ocean and the atmosphere.
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