If 1 source in the whole wide world would say that global warming is a thing, and the rest would say it's phony, would you care for the other sources? Probably yes, but my point is that sources aren't reliable, but you might as well go ahead and trust a sciency site's information, because at no points should you believe something to 100% as things change very often. When saying "things", I'm refering to information.
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Or you could try to do the experiments yourself and come up with the results.