到现在，北极熊一直是针对气候变化问题宣传画的宠物。
Up to now, the polar bear has been the poster child for climate change.
同时北美从北极圈释放出来而且变得气候温和。
At the same time North American was released from the Arctic Circle and became temperate.
同时北美从北极圈释放出来而且变得气候温和。
At the same time North American was released from the Arctic Circle and became temperate.
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