| Renewable energy’s “footprint” myth | |||||
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| 글쓴이 | 관리자 (IP: *.176.22.203) | 작성일 | 2017-03-20 08:37 | 조회수 | 826 |
| 1. 저자 : Amory B. Lovins, Chairman and Chief Scientist, Rocky Mountain Institute (www.rmi.org) 2. 개요 : Land footprint seems an odd criterion for choosing energy systems: the amounts of land at issue are not large, because global renewable energy flows are so vast that only a tiny fraction of them need be captured. For example, economically exploitable wind resources, after excluding land with competing uses, are over nine times total national electricity use in the U.S.i and over twice in Chinaii; before land-use restrictions, the economic resource is over 6× total national electricity use in Britain and 35× worldwide—all at 80-meter hub height, where there’s less energy than at the modern ≥100 m.iii Just the 300 GW of windpower now stuck in the U.S. interconnection queue could displace two-fifths of U.S. coal power. Photovoltaics, counting just one-fifth of their extractable power over land to allow for poor or unavailable sites, could deliver over 150 times the world’s total 2005 electricity consumption,iv The sunlight falling on the Earth every ~70 minutes equals humankind’s entire annual energy use. An average square meter of land receives each year as much solar energy as a barrel of oil contains, and that solar energy is evenly distributed across the world within about twofold.v The U.S., “an intense user of energy, has about 4,000 times more solar energy than its annual electricity use. This same number is about 10,000 worldwide[, so] …if only 1% of land area were used for PV, more than ten times the global energy could be produced….”vi 3. 출처 : www.rmi.org |
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| 파일 | 2011-07_RenewableEnergysFootprintMyth.pdf(243.8K) | ||||
| 번호 | 제목 | 작성자 | 작성일 | 조회수 |
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| 4 | Renewable energy’s “footprint” myth | 관리자 | 17-03-20 | 827 |
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