Vanuatu's population growth has caused concern for the environment in several areas. Water pollution in urban areas is a problem due to inadequate sanitation systems. A majority of the country's population does not have access to a reliable supply of safe drinking water. The nation's logging industry threatens the forests and contributes to the problem of soil erosion. Forests currently cover 75% of the land area. The reefs on Vanuatu's coasts, which are the home of the country's marine life, are threatened by inappropriate fishing methods and siltation. In 1987, the government formed the National Advisory Committee on the Environment (NACE) to address the nation's developing environmental concerns. The estuarine crocodile, hawksbill turtle, Fiji banded iguana, and insular flying fox are threatened species.