To qualify as a ‘biodiversity hotspot’, an area should

contain at least 1,500 species of vertebrates and have lost at least 70 per cent of its primary vegetation

contain at least 1,500 species of endemic vascular plants and have lost at least 70 per cent of its primary vegetation 

cover at least two per cent of the Earth’s land area and have lost at least 70 per cent of its primary vegetation

contain at least 1,500 endemic species and at least 70 per cent of them do not face the threat of extinction