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During the Jurassic Period (200 mya), average CO2 concentrations were about 1800 ppm or about 4.7 times higher than today. The highest concentrations of CO2 during all of the Paleozoic Era occurred during the Cambrian Period, nearly 7000 ppm — about 18 times higher than today.
Ja, men då körde vi med väldigt gamla bilar utan katalysator och mycket svavel i bensinen. Plastpåsarna var dessutom gratis på både Ica och Coop