Each time we get a surge the temperature goes up about half a degree over a period of 25 to thirty years. If the temperature has risen about .85C so far since 1890 and holds steady for 27 years until 2030 and we then get a .5C surge during the next 25 years the temperature will have risen 1.3C by 2055 or so.
This is well on track for the IPCC prediction. As we are in uncharted territory for World global warming of this sort it is not likely to be as predictable as that and I fear that the outcome will be a lot worse and a lot quicker than we think but it is anyone’s guess.