Millennium Ecosystem Assessment

Millennium Ecosystem Assessment - 6. More than half of all...

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Millennium Ecosystem Assessment/ United Nations 1. Humans have changed ecosystems more rapidly and extensively over the past 50 years than in any comparable period in history. 2. Between 1960 and 2000 the world population doubled. 3. Over the same period, food production increased by 250 per cent, water use doubled, wood pulp and paper harvests tripled, hydropower doubled, and timber production rose by more than a half. 4. The amount of water impounded behind dams has quadrupled since 1960, and up to six times more water is now held in reservoirs than in rivers. . 5. It is estimated that one quarter of the world’s coral reefs and about 35 per cent of its mangroves were destroyed or badly degraded in the last decade of the 20th century.
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Unformatted text preview: 6. More than half of all the synthetic nitrogen fertilizer eve used was applied after 1985. 7. The atmospheric concentration of carbon dioxide has increased by almost a third since 1750; 60 per cent of that increase has happened since 1959. 8. A quarter of commercially important fish stocks are over-harvested. 9. Up to 35 per cent of irrigation withdrawals could exceed replenishment rates. 10. More than a billion people survive on less than $1 a day. 11. Approximately 856 million people are under-nourished. 12. Up to 2 billion people are affected by water scarcity. 13. Approximately 1.8 million people still die annually due to inadequate hygiene, sanitation or water supply....
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This note was uploaded on 04/28/2011 for the course ANTH 482 taught by Professor Mills during the Spring '11 term at University of Hawaii, Manoa.

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