Coal
Oil
Natural gaz
All these fuels from hell come from underground, are exhaustible and emit CO2 and other pollutants when they are burned for transportation and industrial use.
These fuels are in contrast with "Fuels from Heaven": wind, hydroelectric, tidal, biomass and solar power. These all come from above the ground, are endlessly renewable and produce no harmful emission.
Please read Thomas L. Friedman "Hot, Flat, and Crowded".
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