At 800 times denser than air, water can drive smaller turbines to produce greater energy than wind. Referred to as marine current energy, tidal stream turbines work much like submerged windmills and could replace half the world’s coal by 2050.
from Forbes Real Time http://www.forbes.com/sites/jamesconca/2017/07/27/tidal-energy-all-renewables-are-not-created-equal/
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