Solar, wind, and tide are very dispersed forms of energy, so harvesting them on a significant scale has a massive environmental impact. Also there are issues re

Solar, wind, and tide are very dispersed forms of energy, so harvesting them on a significant scale has a massive environmental impact. Also there are issues relating to extracting the input materials, and to waste disposal after the devices are retired. It's not clear to me that "green" energies are any better than fossil fuels.