This year's Edinburgh Fringe features a nicely-green show in which the audience travels through the city on bikes to eavesdrop on other cyclists' thoughts and record their own.
First question they might ponder: how many of us drove or flew here?
If you drive to Edinburgh you will get through about 1,350 tonnes of precursor plant material each way.
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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