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Annual Review of Environment and Resources

Volume 28, 2003

Global State of Biodiversity and Loss

Abstract

Biodiversity, a central component of Earth's life support systems, is directly relevant to human societies. We examine the dimensions and nature of the Earth's terrestrial biodiversity and review the scientific facts concerning the rate of loss of biodiversity and the drivers of this loss. The estimate for the total number of species of eukaryotic organisms possible lies in the 5–15 million range, with a best guess of ∼7 million. Species diversity is unevenly distributed; the highest concentrations are in tropical ecosystems. Endemisms are concentrated in a few hotspots, which are in turn seriously threatened by habitat destruction—the most prominent driver of biodiversity loss. For the past 300 years, recorded extinctions for a few groups of organisms reveal rates of extinction at least several hundred times the rate expected on the basis of the geological record. The loss of biodiversity is the only truly irreversible global environmental change the Earth faces today.

Keyword(s): biodiversity hotspots, endemism, extinction, species diversity, species threatening
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/content/journals/10.1146/annurev.energy.28.050302.105532
2003-11-01
2025-04-25
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Global State of Biodiversity and Loss
Annual Review of Environment and Resources 28, 137 (2003); https://doi.org/10.1146/annurev.energy.28.050302.105532
/content/journals/10.1146/annurev.energy.28.050302.105532
/content/journals/10.1146/annurev.energy.28.050302.105532
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