Global fast fashion brands are helping drive pollution that has dyed African rivers blue or turned their waters as alkaline as bleach, according to a report published. Water Witness International's (WWI) report featured the polluted rivers in Lesotho in southern Africa and Tanzania to highlight the risks posed as global brands increasingly source garments from contractors in Africa, attracted by cheap labour and tax incentives. Global brands could force better practices, but so far their presence in Africa has done little to stem rife pollution, water hoarding by contracting factories or even ensure adequate water and sanitation for factory staff, Nick Hepworth, director of WWI and author of the report, said.