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>Author's 2nd assumption is that as tidal energy is tapped, this is extra energy that subtracts from Earth's rotation.

Not so. The calculation of the 1031 years is equation 19 and assumes the decrease in rotational energy all goes to human purposes.

The flaw in the OP is the assumption that human consumption keeps rising at .02 per year for 1031 years: we would probably boil the oceans away because of the waste heat from using that much electrical power.



> we would probably boil the oceans away because of the waste heat from using that much electrical power.

Which would slow the earth due to the change in angular momentum




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