Please check out the Intergovernmental Panel on Climate change reports at the link below. The IPCC is a collaboration between the major climate scientists around the world from all scientifically relevant fields. Their reports are those presented to the presidents/leaders of countries for determining policy action on climate change. They asserted, when first formed, that humans have definitely contributed to global warming. Whether they “caused” it is another story. However, we have significantly contributed to its effects such that if we don’t do something about it our the world we know will significantly change.
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