Thanks for putting this up David. I see you get 2C/doubling. I used Berkeley Earth, Keeling and Law Dome C dating back to 1850 and got 2.2C. As I'm sure you know, you don't even need to divide by log2[CO2_1850] since that only affects the y-intercept and not the slope. The other thing you can see from this is that if you restricted the time interval to say, 1970 to today, the slope would be higher and the fit would be better. The fit isn't as good earlier in time because natural variability played a stronger role. But, my attitude is to use all the data available just to see how far back you might expect feedbacks to kick in. As we know from the works of Jevrejeva, as well as Church, sea level rise dates back to at least the mid 19th century.
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