[secstate]

While you're not technically wrong, the idea of net-zero sources of energy does not address what happens when you start concentrating "free energy" in new places. Fish farms are ecologically monstrosities in most places they exist. Electricity is only one input, fresh water is another, and we haven't figured out where to get that much fresh water for free yet.

In many ways these arguments of "there's free energy from hydrogen fusion" feels similar to arguments about solving invasive species with another species because we haven't figured out that the new species will be invasive yet. And in a similar fashion, the local ecology may eventually re-balance (indeed, likely will) but what time scale are we looking at? Humans need human time scales.

[greedo]

Almost all our agriculture AND aquaculture are ecological monstrosities because we don't make the producers pay for externalities.