The fourth Global Environment Outlook: environment for development (GEO-4) assessment is a comprehensive and authoritative UN report on environment, development and human well-being, providing incisive analysis and information for decision making. It has found that water, land, air, plants, animals and fish are all in "inexorable decline". More than 2 million people are possibly dying prematurely of air pollution, and close to 2 billion are likely to suffer absolute water scarcity by 2025. Put bluntly, the report warns that the world's 6.75 billion people had reached a stage where "the amount of resources needed to sustain it exceeds what is available". United Nations Environment Program (UNEP), October 2007.