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Have people forgotten about the abiotic life? All we ever think of now is the biotic life! During the Middle Carboniferous Period the climate was tropical and humid. However, throughout the Late Carboniferous Period Earth’s climate was completely different. It became progressively cooler and drier. This Period has been separated into the Mississippian (Lower Carboniferous; from 345 to 310 million years ago when it began to increase of land areas and winged insects) and the Pennsylvanian (Upper Carboniferous; form 310 million to 280 million years ago; warm climate; swampy land) in the United States. In the US most of the land is somewhere around 30 degrees North, latitude passes through __a lot__ of land.