That seems unsupportable. Climate models make predictions and those predictions can be checked later. In fact the results are in, and despite what deniers claim, the models are not overstating the problem. If you doubt that, watch this video:

https://www.youtube.com/watch?v=ugwqXKHLrGk&t=2s

"Gah, just another youtube idiot", I can hear you say. But here is the difference. The guy is a geologist by degree and spent his career as a science reporter. He repeatedly says: don't believe me, just like you shouldn't believe the press reporting on it (which is always prone to simplistic summaries and hyperbole). What sets him apart, besides his level tone, is he reads primary sources (and encourages you to do so too) and cites all of his sources, unlike just about every denialist. If he later finds out he has some fact wrong, he happily admits it and posts the correction prominently in the video description.

As far as physics and biology ... those are very broad fields and some of it is falsifiable and some not.

Please read Popper.

It's not falsifiable in the sense that it's factual and so that makes it practically impossible to falsify, but if it wasn't factual it would absolutely be falsifiable.

It isn't like some magical invisible ephemeral floating teapot with no mass that senses peoples attempts to detect it and evades them intelligently.