●6th Mass Extinction
•Mass extinction refers to a substantial increase in the degree of extinction or when the Earth loses more than three-quarters of its species in a geologically short period of time.
•So far, the Earth has experienced five mass extinctions
1.First Mass Extinction:(444 million years ago): 86% of species lost (Severe ice age that lowered sea levels, possibly triggered by the uplift of the Appalachians)
2. Second Mass Extinction 🙁 383-359 million years ago) :75% of species lost (With the emergence of land plants, their deep roots stirred up the earth, releasing nutrients into the ocean. )
3.Third Mass Extinction: (252 million years ago): 96% of species lost due cataclysmic eruption near Siberia blasted CO2 into the atmosphere.
4. Fourth Mass Extinction: (201 million years ago) : 80% of species lost (No clear causes have been found)
5. Fifth Mass Extinction: (66 million years ago) : 76% of all species lost due to Volcanic activity and climate change along with asteroid species
•The five mass extinctions that took place in the last 450 million years have led to the destruction of 70-95% of the species of plants, animals and microorganisms that existed earlier
•Recently, the researchers have observed that the ongoing sixth mass extinction is one of the most serious environmental threats to the existence of civilisation.