Carbon Footprint: 19 Million Metric Tons (6th).

碳排放量：190万公吨(6位)。

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Carbon Footprint: 6.4 Million Metric Tons (1st).

碳排放量：64万公吨(1位)。

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Carbon Footprint: 16.2 Million Metric Tons (4th).

碳排放量：1620万公吨(4位)。

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One scientist estimated that if all the HeLa cells ever grown were gathered together, they would weigh more than fifty million metric tons.

VOA: special.2010.07.21

Iron ore production in the three months hit 32.45 million metric tons, up from 29.4 million tons a year earlier.

VOA: standard.2010.01.21

The European Union imports more than one million metric tons of U.S. wheat each year.

WSJ: Asian Buyers Shun U.S. Wheat

The U.S. produced a total of about 6, 633.2 million metric tons of greenhouse gases in 2009.

FORBES: EPA Greenhouse Gas Inventory Shows 6 Percent Drop In CO2

The commercial sector, businesses, emitted slightly more: from 403.5 million metric tons to 409.5.

FORBES: EPA Greenhouse Gas Inventory Shows 6 Percent Drop In CO2