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CLIMATE SCIENCE
Scientist play down 'tipping point' theory
by Staff Writers
Adelaide, Australia (UPI) Feb 28, 2013


Results from Antarctic lake drill on hold
St. Petersburg, Russia (UPI) Mar 1, 2013 - Russian scientists obtaining samples from a frozen Antarctic lake say it could take months to determine if life exists in the water from 2 miles beneath ice.

"Let's maintain the intrigue a little longer," Vladimir Lipenkov, a climatologist at Russia's Arctic and Antarctic Research Institute, told RIA Novosti.

The samples from Lake Vostok, an ancient lake sealed under miles of ice, are on a research vessel, which is to will return to St. Petersburg, Russia, from the Southern Hemisphere in May, Lipenkov said.

Analysis of the samples will then start, he said.

The largest sub-glacial lake in Antarctica, Lake Vostok may contain unique microscopic life-forms that evolved after it was isolated from the outside world by the ice sheet 18 million years ago, the researchers said.

The scientists completed a project to drill through the ice into the lake and gathered samples of water that froze in the borehole in January.

The Antarctic findings could give clues to life under extreme conditions similar to those found outside the Earth, Valery Lukin, head of the Russian Antarctic Expedition, said.

"I'd compare it to space research," Lukin said. "Understanding of the sub-glacial environment expands human knowledge, the same as studying other objects of the solar system."

A doomsday-like scenario of sudden, irreversible change to the Earth's ecology -- a tipping point -- is not supported by science, Australian researchers say.

Writing in the journal Trends in Ecology and Evolution, scientists from the University of Adelaide, along with U.S. and British colleagues, argue that global-scale ecological tipping points are unlikely and that ecological change over large areas seem to follow a more gradual, smooth pattern.

"This is good news because it says that we might avoid the doom-and-gloom scenario of abrupt, irreversible change," Barry Brook, lead author of the paper and Director of Climate Science at the University of Adelaide, said. "A focus on planetary tipping points may both distract from the vast ecological transformations that have already occurred, and lead to unjustified fatalism about the catastrophic effects of tipping points."

The scientists say they refute recent efforts to define "planetary tipping points" -- critical levels of biodiversity loss or land-use change that would have global effect -- often presented as fact to policy makers.

"An emphasis on a point of no return is not particularly helpful for bringing about the conservation action we need," Brook said in a university release Thursday..

A planetary tipping point, the authors suggest, could theoretically occur if ecosystems across Earth respond in similar ways to the same human pressures, or if there are strong connections between continents that allow for rapid diffusion of impacts across the planet.

"These criteria, however, are very unlikely to be met in the real world," Brook said. "First, ecosystems on different continents are not strongly connected. Second, the responses of ecosystems to human pressures like climate change or land-use change depend on local circumstances and will therefore differ between localities."

The four principal drivers of terrestrial ecosystem change -- climate change, land-use change, habitat fragmentation and biodiversity loss -- are unlikely to induce global tipping points, the researchers said.

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