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Unknown, 2003
Current format, Unknown, 2003, , No Longer Available.
Unknown, 2003
Current format, Unknown, 2003, , No Longer Available. Offered in 0 more formats
Describes how heat beneath Earth's surface and plants and animals can be used as sources of power, how using this power affects the environment, and what the future significance of geothermal power and bio-energy may be.
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