One way to know you’re dealing with scientific theory is it makes testable predictions. So it is with the theory of climate change 20 years ago, and now we know, the predictions were valid:
Livescience — The accuracy of the 1990 predictions is notable because scientists, 22 years ago, relied on much more simplistic computer models than those now used to simulate the future, said one of the researchers behind the current analysis, Dáithí Stone, now a research scientist at Lawrence Berkeley National Laboratory. He worked on the analysis while at the University of Cape Town and University of Oxford. …
The 1990 report offered a best estimate of an increase of 2 degrees Fahrenheit (1.1 degrees Celsius) by 2030, which at the halfway point in 2010, translates to warming of 1 degree F (0.55 degrees C). Stone and Frame compared this expected increase to two sets of temperature records for 1990 through 2010, which showed increases of 0.63 degrees F (0.35 degrees C) and 0.7 degrees F (0.39 degrees C), respectively.
Ding ding ding! We have a valid prediction. What next? As far as the science there are more complicated predictions already made by various researchers. Those that are borne out will be vindicated. Meanwhile, the earth’s cryosphere melts and our oceans warm.