The Global Biodiversity Assessment is an independent, peer-reviewed, scientific analysis and assessment of the biological and socio-economic aspects of biodiversity. It was commissioned by the United Nations Environment Programme (UNEP) and funded by the Global Environment Facility (GEF). The main conclusions drawn by the Assessment are presented in this Summary for Policy-Makers, which, together with the Executive Summary, has been prepared by the Editorial Group of the Global Biodiversity Assessment.