美国现在就是个烂摊子，在20世纪美国成为最成功的国家之前也经历了很多的挫折。
America was a mess and had a lot of setbacks just as it was on the verge of becoming the most successful country in the 20th century.
这意味着很多这些看起来不起眼的苔藓“地毯”在人类一个世纪前涉足这块大陆前就已经存在了——而且可能是很久之前。
That means many of these unassuming mossy carpets were there when humans first made it to the continent a century ago-and likely well before.
全球温度可能直到本世纪的后半叶才会急剧的增长，但是在此之前会发生很多气候灾难。
The really big rise in global temperature probably won't take place until the second half of this century, but there will be plenty of damage long before then.
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