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Originally Posted by orange4boy
Even a stationary windmill is very inefficient the only way it works is because it is harvesting energy that's generated by the sun.
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Where were you when I was taking that final May of last year?! It was something like "All renewable energy is derived from:"
I am guessing that "Jet fuel cannot melt steel" was the incorrect answer...
Hopefully, it was not actually "all..."
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Most renewable energy comes either directly or indirectly from the sun. [...]
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I am not sure that he explained that wind was solar-powered. Do breezes subside at night? They mention that, winds and the sun cause evaporation, and rainwater generates hydroelectric power. Precipitation and sunlight cause plants to grow, which is needed for biomass.
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And the energy of the ocean's tides come from the gravitational pull of the moon and the sun upon the Earth.
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Solar again! Except, the first Google result told me that the sun only pulled 3% as hard as the moon. However, the main page adds "The sun also warms the surface of the ocean more than the ocean depths, creating a temperature difference that can be used as an energy source."
Importance of Renewable Energy and Types of Renewable Energy Resources
Orange, you must have known all of that, but I am pretty sure that professor did not describe all of that, or mention that geothermal did not have anything to do with Sol.