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There's been a lot of bio-fuel engines running around. Even if they're implemented, there's still the issue of producing the bio-fuels which will still have an impact on the environment. Good thing I'm taking an environment chem class this quarter.
Interesting. In autoshop class last year, we had a Neon come in and it was running off of a chemical (can't remember which) and water. It was really intriguing.
True but development using those would still take up some resources and harm the environment. The trick is to find one that's mass reproducable and limits its impact on the environment.
That's just it, they wouldn't harm the environment. You can grow algae in your kitchen. It's entirely possible to grow it and have processing plants in existing industrial areas. Seaweed can be an underwater crop. People just throw olive pits away. Why not use them?