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Apparently according to some scientists global warming is not man made; it's coming from space and it may have contributed to killing life during the Late Devonian extinction. Exploding stars, Supernovas. Science is looking for iron-60, plutonium-244 and samarium-146 from that period in geographic layers.
An Exploding Star 65 Light-Years Away From Earth May Have Triggered a Mass Extinction
An Exploding Star 65 Light-Years Away From Earth May Have Triggered a Mass Extinction