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Answer No, there are plenty of non-human explanations why any warming would take place. One such explanation is the Milankovitch cycle. It states that the Earth’s tilt on its axis changes causing warmer or cooler temperatures. Another explanation of warming is sun cycles. The sun goes through phases of higher activity and magnetism and phases of lower activity and magnetism, which could change climate. It also could be the Earth cycling through phases of warm and cool temperatures. The Earth warmed from the years 800-1200 and then cooled for a couple hundred years. Those are just a few possible explanations of global warming.

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