She and other scientists are researching whether there might be a 'tipping point' for Arctic sea ice -a point at which sea ice will disappear and never recover, even if the climate cools.
她与同事致力于研究对于北冰洋上的海冰是否存在一个不可逆转的“消融点”，一旦达到该点即使气候转凉海冰也无法恢复原来的覆盖量。
Current global warming from greenhouse gases generated by human activities could warm the arctic to levels above the melting point of ice, the study said.
该研究称，人类活动产生的温室气体所造成的当前全球变暖可能使北极暖化程度高于冰的融点。
At that point, Arctic ice becomes a memory, and we will find ourselves on a very different planet.
到那时候，北极冰将会是一种记忆，而我们会发现我们的星球不同以往了。
Few now disagree that, at some point this century, the Arctic will start to see ice-free summers.
很少有人会反对，本世纪的某一时间，北冰洋将存在完全无冰的夏季。
BOULDER, Colo., June 30 (UPI) — climate systems in the arctic may be more affected by global warming than previously thought and may be nearing a climate-change tipping point, a study says.
博尔德，科罗拉多，6月30日(合众国际社)- - -一项研究报告，北极气候系统受全球变暖影响可能比以前所认为的更大，也许正接近气候变化的临界点。
After last week's 24 hour delay to the Catlin Arctic Survey, I've just stepped off the plane which took us to the drop-off point for the start of the expedition.
上周，我们的出发时间推迟了24小时。不过现在，飞机已经降落在北极。
James Screen, a researcher at the University of Melbourne, Australia, who led the study, said: "The concept of Arctic sea ice having a tipping point is still hotly debated.
澳大利亚墨尔本大学的研究员詹姆斯·斯克林（JamesScreen）是这项研究的主要负责人，他说：“在北极海冰是否处于临界点的问题上存在着激烈的辩论。
She and other scientists are researching whether there might be a 'tipping point' for Arctic sea ice - a point at which sea ice will disappear and never recover, even if the climate cools.
她与同事致力于研究对于北冰洋上的海冰是否存在一个不可逆转的“消融点”，一旦达到该点即使气候转凉海冰也无法恢复原来的覆盖量。
Sea ice cover is in a downward spiral and may have passed the point of no return, with a possible ice-free Arctic Ocean by summer 2030, senior scientist Mark Serreze said.
资深科学家马克?塞雷利兹说，北极海冰面积呈螺旋式下降而且可能已经超过极限点。到2030年夏季，北冰洋的海冰可能将全部融化。
Sea ice cover is in a downward spiral and may have passed the point of no return, with a possible ice-free Arctic Ocean by summer 2030, senior scientist Mark Serreze said.
资深科学家马克?塞雷利兹说，北极海冰面积呈螺旋式下降而且可能已经超过极限点。到2030年夏季，北冰洋的海冰可能将全部融化。
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