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RE: How soon will energy farms become a reality?
Renewable energy sources, also called alternative energy, are mainly wind, sun, water, and other sources. The most important characteristic of this energy as well as sustainable energy is that clean energy does not add further pollution to our natural environment or to human health
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Harvesting of this energy is free and non-polluting, but to build the components for energy harvesting requires materials, which have to be mined or obtained by industrial processes. Also the way we deal with old and broken parts (e.g. old solar panels) determines how clean this energy really is. Because if we just throw old solar panels on a pile in landfill, we will just recklessly let valuable materials rot and pollute our land and water. (Source where I got this information: https://greentumble.com/solar-energy-pros-and-cons/)