Getting it wrong: George White's argument against AGW (Pt 1)

George White mounts an argument;that the theory of global warming fails certain essential emperical tests. Specifically, he argues the temperature increase in the lower troposphere is to low to be consistent with global warming over the period of satellite observations; and that climate sensitivity is, at most, about one sixth of that determined by the IPCC.

Considering the former argument first, he writes:

"The first prediction of AGW to fail, is that a 20% increase in CO₂ is expected to cause an increase in the average global temperature of about 0.8°C. Detecting trends in satellite data is difficult for many reasons. Year to year differences can exceed 1°C, global seasonal variability exceeds 3.5°C, hemispheric seasonal variability exceeds 12°C and discontinuities arise as the data from different satellites is merged, however; a 25 year trend this large should be evident and it's not."