 However, the UNEP also estimates that 36% of China's closed forests are facing pressure from high population densities, making preservation efforts especially important.In 2011, Conservation International listed the forests of south-west Sichuan as one of the world's ten most threatened forest regions.According to the Chinese government website, the Central Government invested more than 40 billion yuan between 1998 and 2001 on protection of vegetation, farm subsidies and conversion of farmland to forest.