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Significant changes in the composition of the atmosphere and changes in global average temperatures are environmental changes that have caused mass extinction events in the past.

For example the oxygenation event that occurred approximately 2.4 billion years ago is thought to have wiped out a large proportion of the pre-existing anaerobic organisms.

The K-T boundary (65.5 million years ago) marks the point when it is thought that significant extinction of the dinosaurs occurred which is thought to have been caused by global cooling brought about in part by very large scale volcanism (a large igneous province) and the impact of an asteroid which threw large amounts of debris into the atmosphere causing a reduction of incident radiation from the sun.

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Tyree West

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4y ago

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