Weight of earth = 6E+24 kg
Weight of entire human population ( assuming an average weight of 50 kg - infants through adults - and a world population of 6 billions ) = 3E+11 kg
Ratio ( weight of world human population : weight of earth ) = 1 : 2E+13
Weight of a centimetre long human hair = 1E-4 grams
The above ratio is like the weight of one hair against the weight of 400000 persons.
Are human affairs really capable of making an impact ?
The reply may be comparison with nuclear bomb which can destroy many times its weight.
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