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With regards to solar - the solar panels are just one part of the equation. There's also the storage cells i.e batteries to consider. What's the environmental impact behind the manufacture and ultimate disposal of these batteries? Haven't worked it out but for an average household to enjoy the benefits of energy during non-light periods (in other words when the batteries are discharging) in conjunction with ensuring optimum life of said batteries would probably work out to be a sizable array, (not to mention the space required). No matter which way you look at things there's always going to be an environmental price to pay, even with the so called "clean" energies.
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