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。

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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。

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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。

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The Geographic pole is the top of the axis on which the earth spins, the Magnetic pole is where the compass points to, and the Arctic pole is the point on the Arctic Ocean furthest from any land.

BBC: NEWS | UK | British man scores polar success

"While the ice is disappearing faster than the computer models indicate, both observations and the models point in the same direction: the Arctic is losing ice at an increasingly rapid pace and the impact of greenhouse gases is growing, " said co-author Marika Holland of NCAR.

CNN: Arctic melt worse than predictions

Skeptics point out that global warming is expected to warm Arctic air masses more than Gulf of Mexico air masses, which will therefore diminish the contrast between the two air masses and reduce the strength and likelihood of tornadoes.

FORBES: Alarmists Offer A Perfect Global Warming Challenge