We are now living in the era of the sixth extinction crisis in the history of the planet, the last one occurring 65 million years ago when a meteor struck the Gulf of Mexico and annihilated half of existing species including the dinosaurs. Unlike the last five, however, the sixth extinction crisis is caused by human activity.

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Quote text and notes from Wikiquote: Steven Best (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.