The green sea turtle is a large turtle that can grow to 1.5 metres in length and weigh up to 200 kilograms.It is found in warm coastal waters around the world,but the largest populations today are in Florida and the Caribbean,Hawaii and Borneo.In all these areas the turtles are at risk with populations in Florida and Mexico officially described as endangered.Although in the past there were probably several million green sea turtles in the world,today scientists beleive that fewer than 200,000 adult females remain.Below we list some of the reasons why numbers of this and other sea turtles have declined.