科学家的一项调查发现，极端天气事件、粮食不安全以及淡水短缺可能会导致全球崩溃。
A survey of scientists found that extreme weather events, food insecurity, and freshwater shortages might create global collapse.
但对于今天的中国，印度还有巴西的新中产阶级来说，有工厂的工作，汽车和银行存款，极端不安全的问题已经成为过去。
But for the new middle classes of China, India or Brazil, with factory jobs, cars and bank accounts, the problems of extreme insecurity lie in the past.
极端的寒风会让室外锻炼变得不安全，即使你穿得暖和。
Wind chill extremes can make exercising outdoors unsafe even if you dress warmly.
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