As Gordon Brown visits Saudi Arabia, the Observer's political columnist Andrew Rawnsley writes, 'Green politics matter now more than ever. It is not woolly to be green at this time. It has never been more hard-headed.' His piece ends, 'Green is better than good. It is smart.'
Ancient Peruvian civilisation grew mighty by harvesting guano
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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...
4 hours ago
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