The human race is living beyond its means. A report backed by 1,360 scientists from 95 countries--some of them world leaders in their fields--today warns that the almost two-thirds of the natural machinery that supports life on Earth is being degraded by human pressure.

The study contains what its authors call "a stark warning" for the entire world. The wetlands, forests, savannahs, estuaries, coastal fisheries and other habitats that recycle air, water and nutrients for all living creatures are being irretrievably damaged. In effect, one species is now a hazard to the other 10 million or so on the planet, and to itself.

"Human activity is putting such a strain on the natural functions of Earth that the ability of the planet's ecosystems to sustain future generations can no longer be taken for granted," it says.