The models were coded using assumptions, and we are talking about a chaotic system that is difficult to predict 7 days in advance let alone 70 years. In fact many of these models are based on models of ocean currents recently shown to be wrong. Not that anyone seems to care.
Then, of course, is the question of other factors that might be understated. Solar activity increased in the past 50 years too, but now we have had 18 months and that activity has vanished. Temperatures have historically increased and decreased with the increase and decrease of solar activity. It is an accepted factor in global warming, but looking at Mars and Jupiter it is strange how much extraterrestrial climate change is happening at exactly the same time. Maybe they have underestimated the Sun's importance.
My problem is this: "Climate change" is no longer a real science. The one thing that the hacked emails proved is that Climate Change has become far too political to be called a science. You don't need stolen emails to prove that proponents of the current climate change theory are doing what they can to stifle debate. When the debate is gone, there is no science.
I am willing to admit when I am wrong, but it is not time for that yet. Solar activity may be approaching a minimum, and if it does, it will prove me right or wrong. But I am sure-- damned sure --that if global temperatures fall with the solar activity, a good many of the current scientists echoing the conventional wisdom will adjust their models to prove that they were right all along.