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For those who enjoy having a pool in their backyard: why not convince an eco-entrepreneur to start a line of environmentally-friendly pools, either salt water and/or fresh? Kids would love the idea b/c the possibility of having pet fish and other marine life to swim with would open up if a "habitat" pool was set up. The oxygen output of the pool could be measured and plans made to maintain its stability with the proper nourishment and care. Alternative power sources could be part of the model, i.e. heat provided by photovoltaic cells or windmills. Having an eco-pool would become equivalent of driving a hybrid car!