Scientists say system to treat contaminated wastewater offers a model for ensuring food security in a fast-warming climate All it took to turn the murky, heavily polluted waters of South Africa’s Stiebeuel River into a resource clean enough for irrigating a community’s vegetable plots was a colle...

Source: [Guardian International](https://www.theguardian.com/global-development/2026/aug/31/south-africa-river-pollution-water-treatment-food-security-climate)

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