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The next mass extinction may already be happening. The current extinction rate is at least a thousand times greater than " normal " extinction rate. A " normal " or background extinction rate is average rate of extinction based on the longevity of species through time without human influence, determined by the fossil record. Scientists believe that human impact on the environment is the leading cause of extinction today's.

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Some Scientists theorize that volcanic eruptions spewed tons of co2 into the atmosphere, which trapped heat and acidify the oceans, causing this mass extinction. Other Scientists contend that asteroid or comet impact triggered that extinction. About 80% of life was lost in this extinction, including most of the mammals, making way for the dinosaur

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The permian-Triassic was the deadliest extinction in history: 90% of all life. Scientist believe that volcanic activity in Siberia put massive gas, into that atmosphere. bacteria that thrive on CO2 began producing methane, another greenhouse gas. Large quantities of both gases warm the planet and combined with earth's water

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About 75% of life died off during this period. One theory suggest that ha plants developed deep roots, releasing and abundance of nutrients into the oceans that fed algae. Because of this, algae blooms consumed vast amounts of oxygen (O2) in the oceans, suffocating many species.

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Scientist theorize that there were two main phases to this extinction ; a glaciation event and a heating event. Abundant plant life removed carbon dioxide (CO2) from the air, causing global cooling and glacier formation. This led to a drop in sea levels, reducing habitat.