Just because they didn’t include aerosols doesn’t mean they’re useless. Aerosols might be important, but they’re not the single determining factor for climate change, there are many factors.
If your model includes most of determining factors for the system your modelling, then it’s going to produce pretty good results. There will be places where the model drifts, but you still expect the model to be pointing in pretty much the right direction. As you introduce more factors, your model starts to model details with increasing accuracy, but again you don’t expect it to substantially change the macro result.
I’m short we’re perfectly capable of knowing that the warming will happen without knowing about aerosols, the direction of travel is perfectly predictable, aerosols will only change the amount of travel, and not by an order of magnitude.
If your model includes most of determining factors for the system your modelling, then it’s going to produce pretty good results. There will be places where the model drifts, but you still expect the model to be pointing in pretty much the right direction. As you introduce more factors, your model starts to model details with increasing accuracy, but again you don’t expect it to substantially change the macro result.
I’m short we’re perfectly capable of knowing that the warming will happen without knowing about aerosols, the direction of travel is perfectly predictable, aerosols will only change the amount of travel, and not by an order of magnitude.