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Mangroves are unusual looking trees. They have roots that stand in saltwater and look like cables or ropes laid one on top of another. Mangroves are not just pretty -- they help the environment. But now the first worldwide study warns that one in six of the many different kinds of mangroves could disappear.
As a result of the study, eleven species of mangrove have been placed on the Red List of Threatened Species. The list is kept by the International Union for Conservation of Nature.
