Japan's promising trial of an undersea turbine that generates power from deep ocean currents

This is the kind of concern that struck me from the get-go. Global sea currents are engines for global weather. The Japan Current and it’s analogue, The Gulf Stream, are the reason why the Pacific Northwest and Europe has such mild weather. Should those currents slow dramatically or stop…

Personally, I don’t understand why Japan hasn’t turned to Geothermal energy production. Especially considering the number of hot springs everywhere there. It’s like an obvious solution staring you in the face.