Technology
U.N. report warns environment is at tipping point
June 7, 2012
The earth's environmental systems ``are being pushed towards their biophysical limits,'' beyond which loom sudden, irreversible and potentially catastrophic changes, the United Nations Environment Program warned Wednesday.In a 525-page report on the health of the planet, the agency paints a grim picture: The melting of the polar ice caps, desertification in Africa, deforestation of tropical jungl