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The total diversity of all organisms and ecosystems at various spatial scales (from genes to entire biomes).


"Appendix I: Glossary". IPCC Fourth Assessment Report. 2007.

Alternative definition

The variability among living organisms from all sources including, inter alia, terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems.

Alternative source

Terms and Definitions - FRA 2015, Forest Resources Assessment Working Paper 180, FAO, 2015 (