Louise queries the value of modelling the last 100 years and I am inclined to agree. While your enthusiasm is appreciated Girma I cant help feeling the you are out of your depth when you are attempting to use smoothed data for curve fitting.
There simply isn’t enough reliable data to get valid results. You are extrapolating far too much with data which is too limited in scope as a time series. You are doing the same sort of things that Mann and other mainstream climate scientists have been doing for the past 20 years..