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The renewable energy startup Ze-gen, Inc., has put a new spin on an old technology. Before the advent of the electric light bulb, many cities used coal gasification to provide fuel for their street lamps, and as the costs of oil and natural gas soar, many are reconsidering this old method in the hopes of providing cheaper sources of fuel. But there is a downside. Gasification works by using heat to convert solids into gas, and as we all know, burning coal tends to release large quantities of carbon dioxide, a major cause of global warming.
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