07 Jun 2012:
Environmental Tipping Point
Is Nearing, International Study Says
The rapid warming of the planet, a soaring human population, the steady loss of biodiversity, over-exploitation of energy resources, and the degradation of the world’s oceans are driving the world toward an ecological tipping point
, according to a new study in Nature
. Twenty-two scientists from
five nations compared the major changes taking place today with previous ecological shifts — such as the end of the last Ice Age 14,000 to 18,000 years ago — that triggered mass extinctions of some species, expansions of others, and the creation of new global ecosystems. The paper said that while there is still considerable uncertainty as to whether the world is now approaching such a “state shift,” many signs point to a future of ecological upheaval. “Given all the pressures we are putting on the world, if we do nothing different, I believe we are looking at a time scale of a century or even a few decades for a tipping point to arrive,” lead author Anthony Barnosky
, a biologist at the University of California, Berkeley, said in an interview. The paper appeared in a special issue of Nature
prepared for the upcoming Rio+20 UN conference on sustainable development.
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Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s coral reefs, which are largely intact thanks to stifled coastal development in the communist nation. View the gallery.
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The Warriors of Qiugang
, a Yale Environment 360
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Top Image: aerial view of Iceland
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A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.