全球变冷将使空气更难保持海洋蒸发的水分，从而减少降雨量，使更多的地方面临干旱。
Global cooling meant that the air had less capacity to hold moisture from the oceans, leading to fewer rains and more arid climes.
相反也是如此：当冰雪较多时，它就把更多的太阳能反射回太空，使北极变冷，从而形成更多的海冰。
The opposite is also true: When there is more ice it reflects more solar energy back into space, and cools the Arctic down, which leads to more sea ice forming.
人口密度的上升，结合其他如气候变冷变旱的因素，使采猎为生的纳图夫人(Natufian—约公元前1万年的史前人)短缺橡果、羚羊和野草种。
Rising human population density, combined perhaps with a cooling, drying climate, left the Natufian hunter-gatherers of the region short of acorns, gazelles and wild grass seeds.
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