About 99% of the four billion species that have evolved on Earth have become extinct. In the last 5000 years about 900 species have gone extinct. Only a small percentage of species have been evaluated for their extinction risk.
The International Union for Conservation of Nature declared 15 species extinct in 2020.
For more relevant articles refer to the links given below:
- UPSC Environment and Ecology Questions
- Environment & Ecology Trend Analysis: UPSC Strategy
- UPSC Environment and Ecology
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