Humans spur worst extinctions since dinosaurs: UN

Humans are responsible for the worst spate of extinctions since the dinosaurs and must make unprecedented extra efforts to reach a goal of slowing losses by 2010, a U.N. report said on Monday.

Habitats ranging from coral reefs to tropical rainforests face mounting threats, the Secretariat of the U.N. Convention on Biological Diversity said in the report, issued at the start of a March 20-31 U.N. meeting in Curitiba, Brazil.

"In effect, we are currently responsible for the sixth major extinction event in the history of earth, and the greatest since the dinosaurs disappeared, 65 million years ago," said the 92-page Global Biodiversity Outlook 2 report.

A rising human population of 6.5 billion was undermining the environment for animals and plants via pollution, expanding cities, deforestation, introduction of "alien species" and global warming, it said.

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