[RoosterRedux]

The professor calls global warming pseudoscience because the scientists who study global warming start out with a premise and then look for evidence to prove the premise is true.

Real science would set out to find the truth, not to prove a premise.

[piytar]

So few people understand real science: (1) come up with a hypothesis; (2) come up with and run experiments that can prove OR disprove (falsifiability) the hypothesis; and (3) repeat. A connection between human activity, global warming, climate change, etc., whatever they’re call it this week, cannot be proven or disproven. Ergo, it is not science. This is a very short summary. The Wikipedia article isn’t bad: https://en.m.wikipedia.org/wiki/Scientific_method

[RetiredTexasVet]

“...who study global warming start out with a premise and then look for evidence to prove the premise is true.”

You have just described the theory that the Mann, Hansen, and Jones built their Global Warming Climate Model on: enter the result and the model generates data to support it.