In this sentence:"Now humans are beginning to destroy marine ecosystems through other types of activities, such as disposal and runoff of poisonous waste; in less than two centuries, by significantly reducing the variety of species on Earth, they have unraveled cons of evolution and irrevocably redirected its course."
I don't understand the sentence" they have unraveled cons of evolution and irrevocably redirected its course" Would you pls explain it for me?
The word is eons. Humans have undone millions of years of natural evolution and changed its natural direction.
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