Energy
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Energy is the ability to do work.[1] In physics, energy is a conserved quantity, and a closed system of interacting particles is known to always have the same value for its energy; this is known as the law of conservation of energy.[2]
Energy is also a source of usable heat or power.
References
Energy is very wasted. Everything that comes to the Earth is via the Sun, not counting of course nuclear processes. We should also include gravitational processes like the tides. A Tesla electric car costs about $4 per charge (Discover Magazine, Dec 2009). More later.