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a nuclear plant for example, is actually one of the cleanest and cheapest forms of electricity we have today...but "cleanest" is not clean.
first you have to get the fuel for the plant, not a very clean process and definately not a cheap process.
once you get it into the plant, its clean and cheap, if nothing goes wrong (chernobyl).
once done with the fuel..you will have to store it for a million years, far from human contact in mile deep tunnels, far from cheap...but relatively clean, as long nothing happens during the transport, or with the containers...hopefully it will never contaminate the water deep in the earth..becouse one day it will come up, and end up polluting the fish that we eat, and water we drink.
and if that happens...we will all become "Green", literally or not.
and as a comparison...a windmill, costs a little to build, once in place it will produce energy, forever..if broken it can be repaired, or reused to make forks and spoons of the metal.
if you decide to remove the windmill, after a year you wouldnt even know it ever was there..grass has grown on top of the place it stood on.
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