The philosopher Peter Singer speaks about climate change and our obligation to future generations:
'I'm interested in changing the culture of what we regard as a requirement for living a minimally decent, minimally ethical life.'
(11 mins in)
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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