They base their conclusion on temperature-dependent microwave emissions from molecular oxygen monitored continuously since 1979 by two polar orbiting satellites. The accuracy of satellites as thermometers was seriously debated, critics arguing the likelihood of bias in the data both because of drift in the satellites orbits and the fact that the time at which the satellites pass over particular locations changes from day to day. Moreover they indicated that every attempt to compensate for possible bias in the data strengthened the evidence that cooling has occurred. This was not accepted by Kevin Trenberth who, as he has set forth in a paper with James Hurrell to be published in Nature, argues that Christy and Spencer are insufficiently aware of errors that arise when data from different satellites are stitched together. Until the issue is resolved, we should not rule out the possibility of either flood or ice.
Ideology heats up global-warming debate.
Toronto Globe and Mail, February 8 . Christy, J.R. and R.W. Spencer. Bonobos have a complex social life, and considerable intelligence. In captivity, they have been found capable of learning both sign language and how to make and use stone tools. Now, because of civil strife, the guards have left, food shortages are widespread and the region has received an influx of refugees from urban areas.