Trees line a street in a Johannesburg suburb, Sunday, Aug. 12, 2018. One of the world's largest urban forests is under threat from the polyphagous shot hole borer beetle which is thought to have made its way from Southeast Asia on packing crates or through the movement of plant materials. Many of the city's estimated 6 to 10 million tress are dying and no one has found a way to combat the pest. (AP Photo/Denis Farrell)
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