1. Green College, Oxford University, Upper Meadow, Old Road, Headington, Oxford OX3 8SZ, UK
2. Conservation International, 2501 M Street NW, Washington, DC 20037, USA
3. Centre for Applied Biodiversity Science, Conservation International, 2501 M Street NW, Washington, DC 20037, USA
4. 35 Dorchester Close, Headington, Oxford OX3 8SS, UK

Correspondence to: Norman Myers¹ Correspondence and requests for materials should be addressed to N.M. (e-mail: Email: myers1n@aol.com).

Abstract

Conservationists are far from able to assist all species under threat, if only for lack of funding. This places a premium on priorities: how can we support the most species at the least cost? One way is to identify 'biodiversity hotspots' where exceptional concentrations of endemic species are undergoing exceptional loss of habitat. As many as 44% of all species of vascular plants and 35% of all species in four vertebrate groups are confined to 25 hotspots comprising only 1.4% of the land surface of the Earth. This opens the way for a 'silver bullet' strategy on the part of conservation planners, focusing on these hotspots in proportion to their share of the world's species at risk.

1. Green College, Oxford University, Upper Meadow, Old Road, Headington, Oxford OX3 8SZ, UK
2. Conservation International, 2501 M Street NW, Washington, DC 20037, USA
3. Centre for Applied Biodiversity Science, Conservation International, 2501 M Street NW, Washington, DC 20037, USA
4. 35 Dorchester Close, Headington, Oxford OX3 8SS, UK

Correspondence to: Norman Myers¹ Correspondence and requests for materials should be addressed to N.M. (e-mail: Email: myers1n@aol.com).