在大约10万年的时间里，当海水退去，世界各地的气候变得更加极端：白天更暖和，夜晚更凉爽；夏天更热，冬天更冷。
Over a period of about 100,000 years, while the seas pulled back, climates around the world became dramatically more extreme: warmer days, cooler nights; hotter summers, colder winters.
但是随着海水变暖，它的层次会更加分明，温度更高的海水会停留在表面，而这里正是生物体进行光合作用必需的地方。
As the ocean warms, it becomes more stratified, with the warmer water remaining at the top where the organisms need to be in order to do photosynthesis.
海洋学家马修斯说“阿拉斯加外海的海水就是某种程度上的更加酸化是注定的。”
"Waters off Alaska are sort of preconditioned to become more acidified," says Mathis, a University of Alaska, Fairbanks, oceanographer.
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