For example: desalinization can be done very efficiently using Liquid Fluoride Thorium Reactors, and that energy production method would be far safer and cheaper in the long run than the current nuclear energy systems. [BUT, it would not generate the isotopes in quantity desired by the weapons industries.]
Another perspective is the energy production and utilization processes for the UFOs now flying our skys. Those are not running on gas, and our black-projects technology are making working editions of these crft.
Another “problem” for the Powers That Be is that replacing fossil fuels defunds the terrorist regimes the PTB depend upon to keep the peons scared (and thus willing to trade freedom for (the illusion of) security).