生物学家已经发现，夏末时节，北美及欧洲河流湖泊里的淡水鳗鱼会远迁到大西洋中部聚集。

Biologists have discovered freshwater eels from North American and European rivers and lakes gathering as far as the middle of the Atlantic ocean during late summer.

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还有，全球变暖问题，大坝问题，以及环境污染问题，都使得北美及欧洲地区的野生鳗鱼存活量近年来锐减。

What’s more, global warming, dams and pollution have taken a heavy toll on eel populations in North America and Europe.

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总体上，发达国家——欧洲、北美及日本这些富人区——只占温室气体排放量的一半，量少的可怜。

Over all, the advanced countries - the rich man's club comprising Europe, North America and Japan - account for only about half of greenhouse emissions, and that's a fraction that will fall over time.

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