Ocean currents (UK Telegraph says they can power up the world)

This is interesting: Ocean-currents-can-power-the-world-say-scientists.html I am wondering how much land it would take to power California? Can you imagine an almost free source of electricity? Although people would still make stupid things with it! I like the idea of a video weekly address format with Obama. This alone leaves me feeling so optimistic as clarity and communication is just what we will need to get out of the past eight polarized years!