The 8008 1766

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you may wish to ask him...

a) Regarding the heat island effect: current research exhibits no difference in the global temperature trends when the heat island effect is accounted for

I do not see that Bellamy has addressed Archer's model for CO2 residence times in the atmosphere.

c) you state: "Mann's reconstruction will almost always come up with a hockey-stick curve, no matter what you throw at it (within reason)." The references i cited as independent support for the Mann reconstruction were performed by independent teams with their own datasets on borehole, surface and other temperatures. They did not use Mann's methods.

d) Figure 2) from Prof. Jaworski is a compendium of results from 1958 (Callendar) and 1955 (Slocum) as redrawn in Prof. Jaworski's 1992 book. The graph shows a set of readings taken at different locations and times around the world. Picking out 3 outliers at 550 ppm from different years cannot support a global mean CO2 value of 550 ppm for the period. Further, i submit that the state of the art in CO2 estimation for the past has improved substantially in the last half century, and maintain that a global average of 550 ppm for the period in question is ... dubious.

My position, in large and in sum, is that the data are compelling, the analyses, sound, and the conclusion inescapable: that humans have appreciably influenced the climate in the last century, and continue to do so. You differ, as is your privilege. Perhaps, as more evidence is found, we may reach some agreement.

sidd