PLUS The Quintessence, or Spirit, Consciousness, Higher Awareness. The Quintessence (referred to as Q from now on) was designed to rule the lower elements. We need to use our *Q* factor to solve our increasing energy needs as a planet.
Fire is one of our favorite energy sources. How about using that flaming pizza in the sky to get more of it? SOLAR!
Then there is the fickle but mighty power of Air ... WIND!
and finally, the humble, patient Earth ... GEOTHERMAL! (Not to mention building dwellings down in the earth, or into the sides of hills.)