So care to explain how I am wrong?
"harvesting" wind will not stop the wind from blowing.
"harvesting" tidal energy will not stop the tides from ebbing.
im not sure how you arrived at your hypothesis but in science it's not the burden to disprove the hypothesis it's the burden to prove the hypothesis.
or
science is not used to prove the negative.
more apt would be to ask; How does harvesting these energy resources diminish them?