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Scientists, Using Proxies From Mollusk Shells From Around The World, Are Indicating Increases In The Global Temperature, From Carbon Dioxide Releases, And Mercury Levels, Both From The Eruptions Of The Deccan Traps, Before The Chicxulub Asteroid Wiped Out The Dinosaurs. All Of Which Could Have Led To The Dinosaur Extinction.

Global Mercury Contamination And Warming Preceded Dinosaur Extinction, Study Finds

https://www.forbes.com/sites/trevornace/2019/12/16/global-mercury-contamination-and-warming-preceded-dinosaur-extinction-study-finds/#57d7a8d53c11

Recent research finds there was a global increase in mercury and warming just before the dinosaur extinction event.