Scientists, from Nature studied 20 years of satellite data of the world's 220,000 mountain glaciers, and found that since 2015, glaciers have last 298 billion metric tons off ice and snow per year.

《自然》杂志的科学家们研究了世界上22万座高山冰川20年来的卫星数据，发现自2015年以来，冰川上每年减少的冰雪总量为2980亿公吨。

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Amazon flora, for instance, holds more than 100 billion metric tons of carbon, equal to 15 years of tailpipe and smokestack emissions.

例如亚马逊的植物，持有一千亿吨的碳量，相当于重工业和排气管15年的排射量。

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Atmospheric concentrations of carbon dioxide have reached 386 parts per million-and rising, because every year, human activity spews more than 30 billion metric tons of CO2.

目前大气中CO2(二氧化碳)的浓度已达百万分之386，而且还在上升。因为每年，人类活动要排放出300多亿吨CO2。

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As a nation, the EPA says we spew out the equivalent of around 10 billion metric tons of carbon dioxide.

NPR: And the Biggest Producer of Greenhouse Gases Is ��

It has a resource of 11.35 billion metric tons of iron in the indicated category and 12.39 billion metric tons of iron ore in the inferred category.

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According to a study led by two Stanford University scientists and published earlier this year, advances in high-yield agriculture during the past half-century have prevented massive amounts of greenhouse gases--the equivalent of 590 billion metric tons of carbon dioxide--from entering the atmosphere.

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