How many years of geologic time have humans existed on Earth?
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Geologists have devised a geologic time scale that divides Earth's history into units of time. These units are eras, periods, and epochs. A unit is defined in terms of the fossils or rock types found in it that makes it different from the other units. read more
Source: scienceclarified.com
divide the years you choose for humans being around into 4.5 billion. 4.5 million years = 0.1 % of the age of the earth (one part per thousand). read more
Source: answers.yahoo.com
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