the development of metamodels) all contribute to a deeper understanding of the planet. Measurement and assessment are important issues and are not insurmountable obstacles.
sEE also: Climate Models; Climatic Data, Nature of the Data; Climatic Data, Proxy Records; Computer Models.
BIBLIOGRAPHY. William D. Nordhaus and Joseph Boyer, Warming the World: Economic Models of Global Warming (MIT Press, 2003) S. George Philander, Is the Temperature Rising? The Uncertain Science of Global Warming (Princeton University Press, 2000); Spencer R. Weart, The Discovery of Global Warming (Harvard University Press, 2004).
Eric Ribbens Barbara Ann Ribbens Western Illinois University
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.