Two-thirds of all the primary energy consumed in the world today is wasted, mostly in the form of heat that nobody wants or uses.
5 hours ago
Friday, 4 July 2008
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Ancient Peruvian civilisation grew mighty by harvesting guano - The Chincha Kingdom was transporting seabird excrement from islands to valleys as early as the 13th century, and this powerful fertiliser may have been key...
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