The GHCN data are from the set of data held by the Global Historical Climate Network [available at: www.ncdc.noaa.gov/oa/climate/ghcn-monthly/index.php]. The HADCRUT3 data are from the Hadley Centre

There is considerable agreement with the three sets of data and it is clear that although the northern hemisphere is warming in the manner prescribed by the models, the southern hemisphere is almost unchanged over the period of measurement. The models break down in a fairly spectacular manner. There is clearly an absence of global warming. The warming takes place in the northern hemisphere in which region most of human activity is concentrated and where the vast majority of industry occurs.

            More possible evidence for the asymmetric nature of warming is given by the AIRS Global Map Of Carbon Dioxide From Space shown below.

Although originally designed to measure atmospheric water vapor and temperature profiles for weather forecasting, data from the Atmospheric Infrared Sounder (AIRS) instrument on NASA's Aqua spacecraft are now also being used by scientists to observe the concentration of carbon dioxide in the mid-troposphere (about eight kilometers, or five miles, above the surface).

The global map of mid-troposphere carbon dioxide given in the figure shows that despite the high degree of mixing that occurs with carbon dioxide, the regional patterns of atmospheric sources and sinks are still apparent in mid-troposphere carbon dioxide concentrations. The regions of highest CO₂ concentrations are in northern America and Europe in the northern hemisphere and in Argentina in the southern hemisphere. The CO₂ concentration is relatively low in the Antarctic region and this is consistent with the observed absence of warming.