Since civilization started, humans helped cut the total weight of plants by half.
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When you weigh all life on Earth, billions of humans don't amount to much compared to trees, earthworms or even viruses.Humans only add up to about one ten-thousandth of all life on Earth, measured by the dry weight of the carbon that makes up the structure of all living things, known as biomass.Bacteria are nearly 13 percent of the world's biomass.Since civilization started, humans helped cut the total weight of plants by half and wild mammals by 85 percent, the study said.About one-sixth the weight of a human is dry carbon.
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