Ten per cent of the world's tree species face extinction through felling, forest fires and poor forest management, conservationists said in a report on Tuesday. "With 77 species already extinct, this report has now confirmed out worst nightmare," said Dr Steve Howard of the World Wide Fund for nature(WWF). The world list of threatened trees details over 8,753 of the world's 80,000 to 100,000 tree species as being in danger of extinction.The list is the product of a three-year project by the world conservation monitoring centre, which is partly funded by the WWF and the species survival commission of the World Conservation Union.