【Earth&Sky】科学家:北极正在绿化_英语听力练习mp3下载-科学-沪江听力酷

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【Earth&Sky】科学家:北极正在绿化

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You might picture the Arctic as endlessly white. But Skip Walker, a geobotanist at the University of Alaska, told us that satellite data shows the Arctic is 'greening.'

Skip Walker: There's a lot of things that could happen with greening. You can increase the length of the growing [---1---], so we have started it earlier, we're later in the fall — such things as more shrub cover, greater density of vegetation, less space between the plants on the ground.

[---2---] The warming of Arctic seas means less cold air over the Arctic.

Skip Walker: You can think of the cold air mass that lies over the Arctic ocean as a big pool of cold air that spills over on the land, and the ice content of the ocean, of course, affects the size and the strength of that cold air effect.

Walker's team has been studying some of the most [---3---] areas of the Arctic – including islands near Greenland, Russia and Canada – places he said, that few people will [---4---] see.

Skip Walker: A lot of the areas that are the most remote and people know the least about are probably the most [---5---] of changes that they are going on. We can easily detect changes in biodiversity because there’s very few species there, at present.

I'm Deborah Byrd for E&S, a clear voice for science. We're at ES.org

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