"Extinction is part of life"
: about 98% of all organisms that ever existed on earth have disappeared, reminds us of the Natural History Museum in London.
The history of our planet has indeed been punctuated by mass extinction events, during which species disappeared much faster than they were replaced.
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Thus, the extinction of the Cretaceous due to the impact of an asteroid 66 million years ago saw the eradication of about 76% of all species, including dinosaurs or ammonites.
However, a new study published in the journal
Nature
shows that the current rate of decline of biodiversity in freshwater ecosystems is much faster than at this period and that the damage caused in a few decades by direct action or human indirectness (destruction of habitats, climate change, pollution, etc.) could take millions of years to resolve.
The pace of decline
To compare the current rate of extinction to that of the Cretaceous,
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