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Replacing CO2-producing energy with human energy technologies ... a project in India has replaced diesel pumps with people-operated pumps for irrigation.
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I think the true irony lies in the fact that humans also produce CO2 and probably more of it than they normally do if they are working hard. I wonder how many people are required to duplicate the energy of a desiel engine, and exactly how much extra CO2 they are producing. I doubt it would match the engine by any means, but it sure would be funny if it did.