Two facts are becoming impossible to ignore: oil is getting more expensive, and global warming traceable to our use of fossil fuels will impact civilization in ways that we're only beginning to grasp. MODERN MARVELSÂ® shows how air, water, earth, and fire can be transformed into clean, reliable sources of energy. This incisive hour takes an in-depth look at the most proven and reliable sources: solar, wind, geothermal, biofuels, and tidal power. From the experimental to the tried-and-true, renewable energy sources are overflowing with potential... just waiting to be exploited on a massive scale. Make Earth Day last all year with this collection of green documentaries from HISTORY. Experience the formation of the Earth, learn about the various causes for global warming, and travel over one thousand years into the future to study the fate of mankind's footprint. These four popular specials help viewers understand the problems the planet faces and its possible fate.moreless
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