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What is the most effective alternative energy source?

The answer generally varies depending on the region.  Some alternative energy sources are better suited for some regions over others.  Solar power, wind energy, hydroelectric power, geothermal energy, wave and tidal power, and biofuels are sustainable and renewable energy sources, but their availability varies across regions.

Biofuels are perhaps one of the most efficient and unlimited sources of alternative energy.  Biofuels were originally created using