In South Africa's Franschhoek mountains a helicopter drops off abseilers to cut down invasive pine trees that are choking off water supplies to millions of Cape Town residents already facing climate change-induced shortages. The crews are there to help to remove 54,000 hectares of alien trees by 2025, in the process reclaiming an estimated 55-billion litres of water lost each year - two months water supply for Cape Town.
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