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It's nice to have the math finally laid out for us. 0.08 degrees over 5 years, when extrapolated, means that ground will reach the point of spontaneous combustion right around 3055. That may seem far off now, but, I can assure you, it won't seem that way at the time.
I say, light up those earth-cooling volcanoes NOW!
I think the math was a bit off above. Assuming .08C per year rise in temp and a 260C temp required for spontaneous combustion that and noting that the period above is .08C every 15 years it will be roughly 50 thousand years until we reach the boiling point if all variables are static. If one of those earth cooling volcanoes does indeed erupt (there have been over 25 major volcanoes in the last 2000 years) it would seem as though .08C every 15 years is insignificant in the grand scheme of things.
Ha! the 15 year change when converted to K is 1997 T of 287.52K to 2013 T of 287.60K - that's why these "scientists" don't use the Kelvin scale! The slope is invisible unless the T range is 100ths of a degree K.