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What is the difference between a substance...you mean like global warming ...we have no way of verifying that exists....yet alot of supposedly intelligent individuals believe it
Ummm....a thermometer. Seriously, that's what it takes to measure global warming. You take a long serious of continuous temperature data and you look at the trends compared to previous data. That's how you verify global warming. I think you meant to say "causes of global warming", not global warming itself. Since no one is foolish enough to claim that thermometers don't exist.