Peru is turning to ancient indigenous techniques and natural ecosystems to keep its taps running, as climate change threatens to dry out its water supply. The Andes Mountains are one of six places in the world where complex civilizations emerged, spurred by precipitation so seasonal it was a catalyst for hydrological innovations again and again. People cultivated a deep knowledge of water and the underground, deploying strategies that still astonish – and which some still use. Click here to continue reading