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In the same way that photosynthesis and aerobic cellular respiration work as a water wheel, can't the byproduct from mankind's overconsumption of food, excessive abuse of fossil fuels, etc be recycled as well? An end product from photosynthesis, oxygen, becomes readily avaliable to other organism who in turn utilize it and release carbon dioxide which the same plants then use. Here in essence, nothing is going to "waste." To folllow in suit, the mass amount of actual waste humans leave behind in the air, on the grass, or on the plate can easily be put to good use. If we can continue to manufacure smaller and more compact versions of the ipod and make "healthier" food in addition to the all of the nutritional food provided by mother earth, can't we think of more productive things to do with our waste? If anything, can we strive for the creation of something that functions like photosynthetic bacteria and plants that will ultilize the excess carbon dioxide in the air. Have we already begun? We need to finish this man made water wheel.