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This is the way science works, it is the continual seeking of truth regardless of the outcomes.

The argument isnt if humans are having a role in global warming, its if our role matters in the grand scheme of things.  Human activities release increase the balance of carbon dioxide into the atmosphere, and carbon dioxide is a greenhouse gas in that it allows light to travel freely through it but insulates heat trying to escape, so there is a net gain in heat in the system.