'1% every year'

Humans are wiping out about 1% of all other species every year, and one of the 'great extinction episodes' in the Earth's history is under way.

-- Zoological Society of London (quoted at Wildlife populations 'plummeting').


P.S. 19 May:

Nearly 200 governments will say next week they are unlikely to meet a target of slowing the rate of extinctions of living species by 2010, a failure which could threaten future food supplies.