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This is fairly different from the most important sources of vitality we use proper now, particularly fossil fuels. True, if we did use all of our fossil fuels, they would finally at some point be replenished. But it surely takes the earth tens of 1000’s of years, possibly longer, to filter the carbon out of the atmosphere and put it again underneath the soil. Because this process takes so lengthy, we take into account that fossil fuels are non-renewable. No one alive now will ever see these power sources put again in the floor.