[ArnoVW]

Sure, there is some uncertainty. But in reality, we have a pretty complete model of physics, chemistry, geology and biology. Generally, the predictions we made 10 or 20 years ago match with what we're seeing.

So of course "science does not deal in certainties" but most of the questions are really at the second or third decimal point.

There is an excellent video by David Louapre (of Science Etonnante fame) that explains for example how our greenhouse model works. It's in French, but subtitles should do the tricks https://www.youtube.com/watch?v=ewc8FBtEKPs