No, they haven't. I have yet to see how HUMAN-CAUSED AGW meets any scientific theory criteria. That the temperature is increasing, by a small %, is certainly predictable by the data. But I don't see any scientific causation.
Considering that you mistakenly believed that scientists are building climate models which are based on only 20 years of data, no one should be suprised that you don't see the link between human activities and global warming. I don't know where you're getting your information about climate change and what scientists are doing to study it, but based on what you've written so far, I can tell that you are grossly misinformed.
Scientists have a theory to explain climate change on Earth right now. That theory is based on a vast array of evidence which provides scientists with data they can use to build a model of climate which can be tested and falsified. Of course, climate models are not instantaneously falsifiable, but every year that passes provides scientists with evidence that their climate models are either right or wrong. So far, the models are proving to be right.
Maybe you need to learn what a scientific theory is, how it is testable, and how it can be debunked, before you cut and paste.
Perhaps you need to explain why you think that all the work done on climate change is not science... is not testable... is not falsifiable. Lay it out for us.