Tidal energy is one of the oldest forms of renewable energy, originally used in old-fashioned water mills.
Using a broader definitions, one of the oldest kinds of renewable energy is wind energy, which has been used to move boats across water for thousands of years. Ancient paintings have been found that depict ships being used by the Minoans, part of the Greek civilization. The paintings show relatively basic ships that have sails as well as oars, so the boats appear to have been powered both by wind and human energy. The paintings are estimated to be from 1500 BC, so wind power is more than 3500 years old.
Energy from the sun has been used by humans as long as the species has existed. To grow crops, to heat homes, to dry bricks, to see with.
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