This article from Radio Nederland describes the problems South Africa is having with the black wattle tree (Acacia mearnsii). Black wattle, native to Australia, was introduced to South Africa over a century ago for its bark, which can be used for tanning, and is also valued as a timber tree. Unfortunately, the trees have naturalized, and now cause problems due to their high demand for water. The article also has a link to the radio broadcast of this story, featured on the show "Research File."
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