Healthy ecosystems also produce multiple benefits for communities that rely on them. Goal 15 focuses on preserving and sustainably using the Earth's terrestrial species and ecosystems. The proportion of land area covered by forest decreased from 31.6 per cent in 1990 to 30.8 per cent in 2010 and 30.6 per cent in 2015. Corals, amphibians and cycads are in serious decline due to distinct and worsening threats.