You're right I seem to have misread. Good point about the factor ~9, but even then it doesn't look like we'll be draining the oceans dry any time soon. Althoug

You're right I seem to have misread. Good point about the factor ~9, but even then it doesn't look like we'll be draining the oceans dry any time soon. Although it would be a problem of unimaginable scale to use it as the sole source of energy, which is bound to create some of its own problems, I just don't see any obvious ones.