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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site alternative energy sources Energy sources different from those in widespread use at the moment, which are referred to as conventional. Alternative energy sources include solar, wind, wave, tidal, hydroelectric, and geothermal. Although each has its drawbacks, none of these energy sources produces significant air pollution, unlike conventional sources. Related categories    • ECOLOGY AND THE ENVIRONMENT Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP