‘We’re an evolving laboratory’: the island on a quest to be self-sufficient in energy – The Guardian

Photo: Ofelia de Pablo y Javier Zurita

Avertiginous outcrop with more than 500 volcanoes, El Hierro, the most westerly of the Canary Islands, is less than 12 miles (20km) wide but features elevation differences of more than 1,500 metres.

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