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（James Screen）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。

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Screen said: "The albedo effect is very important here, but there are other factors related to the loss of sea ice that likely play a role.

斯克林说：“反射效应在这里起着很重要的作用，但是还有其他关键的因素与海冰的融化有关。”

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The sea surface is near the top of the screen.

海的表面是在屏幕的顶部附近。

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In 2009, Barack Obama's face on the screen in the Caribbean Sea was as sharply defined as it was at the U.S. Capitol, and some people on the pool deck slathered on sunscreen while others planned shore excursions.

CNN: Commentary: Obama on TV, a blessing and curse

As an object, the Constitution has more in common with the Dead Sea Scrolls than with what we now think of as writing: pixels floating on a screen, words suspended in a digital cloud, bubbles of text.

NEWYORKER: The Commandments