Former U.S. Vice President Al Gore has called on the nation to become totally reliant on renewable energy by 2020. The Nobel Peace Prize winner, now a cleantech venture capitalist, said the key to solving economic and environmental challenges is to stop burning carbon-based fuels. A national electric grid is envisioned to transmit power from solar and wind farms nationwide and to provide infrastructure for plug-in electric cars. Some industry experts say that these these lofty goals are attainable in the 10-year time frame. However, the required expenditure of capital and materials seems daunting, considering that renewables currently comprise only about 8% of national electric capacity. Is this renewables target reachable and realistic?
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