Dave Tweed wrote:
>> Think carefully. Extracting energy from tides and to some extent waves
>> and wind is just converting kinetic energy stored in the earth's
>> rotation, something that was put there a long long time ago and isn't
>> being renewed.
>
> Tides, yes, but wind and waves are essentially solar-powered.

Mostly, which is why I said "to some extent".  Much of the wind patterns are
due to the rotation of the earth, which I know is different than being
powered by them.  I was thinking that the effect that the rotation has is
probably still adding some power and therefore slowing the rotation, but
I'll admit that's a miniscule effect compared to solar heating.  In other
words, yeah you're right.


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