Calling names isn't going to advance your argument.
Orbital models only have two variables when there are two bodies. In reality we are always dealing with an n-body problem. Regarding atmospheric models, we have weather, which is too chaotic to forecast, and climate, which should not be.
We could sit back 100 years and see what is happening then, so that we have lots of good data points, but potentially at the cost of widespread famine, death, etc.
We have excellent reasons to stop releasing sequestered carbon even if we ignore global warming.