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I think you're not reading his comment in good faith. He's clearly not suggesting that whether or not something is true is decided by a vote of scientists. He's saying that the people who are most familiar with the science overwhelmingly believe that the evidence suggests that global warming is in fact real.

Further, people are wise to be skeptical or even dismissive of climate denialist claims because there is a long history of politically motivated people making deliberately but subtly specious arguments for it. Given both the overwhelming consensus and the glut of misinformation, it makes sense to filter it with a very high bar.