200,000 years for all trace of Man to vanish from the Earth: If man were to vanish from the face of the Earth today, his footprint on the planet would linger for the mere blink of an eye in geological terms.
Within hours, nature would begin to eradicate its impact. In 50,000 years all that would remain would be archaeological traces. Only radioactive materials and a few man-made chemical contaminants would last longer ? an invisible legacy. [gráfico aqui]
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