we have had clean energy options sense the 40s. For example Thorium based nuclear power has been around sense before uranium or plutonium, unfortunately thorium didn't have the weapons capabilities of the others. So development was all based around plutonium and uranium. In my opinion "they" will never let clean, virtually free power exist. It would take a cultural revolution to actually allow engineering and science to development real solutions to anything. If it can't make money year over year and be tightly controlled it won't be developed.