I loooove tidal turbines. And with the new materials, theyre actually doable. And microturbines, and bioagents. And nukes, I'm afraid. A lot of them, dedicated to cracking hydrogen The issue is gonna be storage and transportation of energy--batteries aint gonna cut it. Probably fuel cells. The answers are out there, if we invested in finding them. The main question is if we have time. Having an oil junta at the seat of political power has made progress difficult in this area, and meanwhile we as a species are doddering toward the greatest catacylsm that man has ever visited upon man, the hangover from a hundred year binge when the liquor ran out. Ghastly to contemplate. And entirely reconfiguring the world's energy production and delivery infrastructure is not a small job, after all. It might take some time, and no little effort, but I dont see as how we really have a choice not to, if we dont want to have to live through the most horrific years of starvation and war in human history.