This category is intended for science oriented listings. Sites added to this category will be those that provide information on the science of energy conservation. Merchants and consultants are encouraged to list their sites in the Shopping, Regional or Business categories of the Open Directory Project. Emerging potential sources of fossil energy include methane hydrates. Geothermal Web sites about ground-source heat pump technology belong in the Heat Pumps category.
Geothermal energy is heat energy from deep in the earth.
Heat is brought to the near-surface by thermal conduction and by intrusion into the earth's crust of molten magma originating from great depth. Use of hydrothermal energy is economic today at a number of high-grade sites. Web sites about ground-source heat pump technology belong in the Heat Pumps category. Hydrogen Please submit to this category only sites dealing with the scientific and new technology aspects of hydrogen. Hydrogen is the first element on the Periodic Table and is the smallest and lightest atom of all the elements.