NeilBlanchard — micro-tidal. Possibly using the oscillating water column, with acres of storage between a more modest high and low tide. More places.
Also the Bering Strait and that place Boaty McBoatface went to,
the Orkney Passage.
sendler & redpoint5 — So long as we settle for a decreasing rate of increase we're doomed. A negative GDP is not inconsistent with a shift from make-work to insuring forward days of survival.