ZPE
There is still a fair amount of oil left around the world. As was said much of it is extremely hard to reach, or like our Canadian oil sands that are costly to separate.
As long as the world is driven by money, and geared toward the rich, we are going to have these issues. Free energy, while currently possible, is not going to happen until the rich/powerful allow it.
ZPE, or zero point energy is a tappable energy source, unlimited and is somewhat proveable by the casamir effect, this effect happens between a pair of grounded, neutral metal plates placed very close together. A small force can be measured between the plates, which is directly ascribable to a change of the zero-point energy of the electromagnetic field between the plates because only particles with a whole wavelength can exist between them, if not whole, the wave cancels out and there exist more particles pushing on the outside of the plates than inside(more chances of whole wavelengths on the outside of plates than inside). Quantum mechanics states that in a vacuum nothing can be zero and is always fluctuating. Virtual particle pairs continually pop in and then annihilate. All the background fields added up actually amount to massive amounts of energy and is believed to be usable. Similar to Stargate's ZPM. Sounds far fetched, im not a physicists but physics and quantum mechanics are my hobby and its real. look it up.
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