GLOBAL WARMING-an increase in the earth's average atmospheric
             temperature that causes corresponding changes in climate and that may result
             GREENHOUSE EFFECT- heating of the atmosphere resulting from the
             absorption by certain gases of solar energy that has been captured and
             DESERTIFICATION - the processes by which an area becomes a desert.
             DEFORESTIFICATION- the processes that result in the change of forested
             FOSSIL FUEL COMBUSTION- burning of coal, oil (including gasoline), or
             natural gas. This burning releases carbon dioxide, as well as combustion
             by products that can include unburned hydrocarbons, methane, and carbon
             monoxide. Common sources of fossil fuel include cars and electric
             GREENHOUSE GAS- any gas that absorbs infra-red radiation in the
             atmosphere. Greenhouse gases include water vapor, carbon dioxide, methane,
             FOSSIL FUEL- any combustible organic material, as oil, coal, or natural
             gas, derived from the remains of former life
             CLIMATE- the composite or generally prevailing weather conditions of a
             region, as temperature, air pressure, humidity, precipitation,
             cloudiness, and winds, throughout the year, averaged over a series of years.
             THE KYOTO ACCORD- agreed upon in 1997, calls for reduction of
             greenhouse gases around the world by 2012.
             ENVIRONMENTAL PROTECTION AGENCY (EPA), an independent agency of the
             U.S. government established in 1970.
             SIERRA CLUB - nonprofit organization, founded in the U.S. in 1892 by
             the American explorer and naturalist John Muir, dedicated to the
             exploration and preservation of the nation's wilderness and wildlife.
             IPCC- (Intergovernmental Panel on Climate Change) Established in 1988
             by the United Nations Environment Program and the World Meteorological
             Organization to assess information in the sc
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