Until now, Germany has been a significant producer of potash, the term for potassium compounds that are important crop fertilizers. But as the country's potash reserves dwindle, a major supplier, K+S is looking further afield - to Canada.
Water scarcity is a growing problem worldwide, with Africa being hit particularly hard. As temperatures soar and rainfall drops, vital lakes are drying up. We take a look at some of the most startling vanishing acts.
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