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That slashing and burning on such a large scale spewed enormous amounts of greenhouse gasses into the atmosphere and warmed the planet, the study says.
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And yet, CO2 still makes up one of the SMALLEST concentrations of gasses in the atmosphere. I mean come on, dinosaurs probably passed VOLUMES of gas. I am sure they had their own effect on global warming with all the methane they produced. Dinosaur farts are the real culprit.