Environment: The Trees Are Taking Over

An alien arboreal horde invades South Florida

From Yankees fleeing the northern cold to Asian walking catfish to South ; American water hyacinths, southern Florida has suffered through many invasions by persistent foreigners threatening to displace native flora and fauna. The vulnerable peninsula, devasted last month by wide-ranging brush fires, continues to be under attack, this time by alien trees: the Brazilian pepper and the Australian pine and Melaleuca, all amazingly prolific and fast spreading. Laments Julia Morton, a University of Miami botanist: "These trees are entirely too healthy. They don't have natural enemies here."

As is so often true, the incursion of aliens was abetted and, in...

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