The United Nations Environment Programme’s (UNEP) Global Environment Outlook: environment for development (GEO-4) report published 20 years after the World Commission on Environment and Development, assesses the current state of the global atmosphere, land, water and biodiversity, describes the changes since 1987, and identifies priorities for action. Failure to address these persistent problems, UNEP says, may undo all the achievements so far on the simpler issues, and may threaten humanity’s survival.

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