Scientists are aiming to grow 4,500 trees at a national park with the help of fertiliser made from festivalgoers’ urine. The fertiliser was created by the Bristol-based startup NPK Recovery, which connected its unit to a block of toilets used by 700 revellers at Boomtown festival in Hampshire in July last year. The urine was turned into 540 litres of fertiliser product during the 2025 event, and will now be used to grow native trees, such as beech, on the edge of Bannau Brycheiniog, also known as the Brecon Beacons, in Wales. Urine from other sources will also be used
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