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shikamaru317 said:

He has a point. Scientists always think they know something, once upon a time the scientific community thought the Earth was flat and that the Sun revolved around the Earth, they were wrong. Modern Science is not incontrovertible. While the climate definitely is changing, there is no way to know for certain that it's human caused rather than the natural climate changes this planet has always had.

No, but until we find some evidence that completely shakes up our understanding of how earth's climate works that disproves and unvalidifies all the evidence in support of man-made global warming, the natural course of action would be to presume that it is true until such hypothetical evidence arises. Especially because the consequences of it not being true but us trying do something about it because we thought it was true won't be that bad, however if we don't do anything and it is true, the consequences will be enormous.