The study, by 1,360 experts in 95 nations, said a rising human population had polluted or over-exploited two thirds of the ecological systems on which life depends, ranging from clean air to fresh water, in the past 50 years.
"At the heart of this assessment is a stark warning," said the 45-member board of the Millennium Ecosystem Assessment.
"Human activity is putting such 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 said.
Ten to 30 percent of mammal, bird and amphibian species were already threatened with extinction, according to the assessment, the biggest review of the planet's life support systems.
"Over the past 50 years, humans have changed ecosystems more rapidly and extensively than in any comparable time in human history, largely to meet rapidly growing demands for food, fresh water, timber, fibre and fuel," the report said.
"This has resulted in a......
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