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I think 'mental activity' is proactive 'problem solving'. From that perspective, plants don't need to solve problems. The 'need to feed' requires ceaseless problem solving. In that respect, I could imagine that AI could be based upon a need other than energy consumption, but I am not sure what that could be. Hopefully it isn't a need to eradicate humans. :)
Hm. If a need-to-feed does underpin intelligence, what would be the effects of limitless energy such as fusion? Would our social intelligence atrophy?