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Green turtles are threatened by overharvesting and habitat degradation. The eggs, juveniles and adults are taken as food by some people. As their nesting locations are predictable, they are susceptible to exploitation. The harvest of algae reduces food availability for adult turtles, which feed on these plants. At the same time, the nesting and feeding sites are degraded in various ways, such as through coastal development, pollution and altering the coastlines. Green turtles can be harmed by ingesting or getting entangled in plastic debris. Sand replenishment and reduction of coastal vegetation could alter the temperature of the sand, thus giving rise to populations with a biased sex ratio.