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Renewable energy systems include wind power, biomass, photovoltaics, hydropower, solar thermal, thermal ponds, and biogas. Wood and crop residues also are being used as fuel. All renewable energy systems need to be investigated because humankind has only about 40 years of oil and gas reserves remaining.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.