Few people have even the slightest notion how difficult it is to come up with even moderately plausible estimates of global temperature. Every measuring system has its strengths and weaknesses. Those handling them have their abilities and disabilities, their biases and blind spots. And a great deal of what goes on is politically driven to bring about predetermined results.

Bob Tisdale addresses the issue ably in a recent post at WattsUpwithThat.com. One of the most valuable aspects of his post is that it will alert readers not previously familiar with them with the ways in which climate alarmists have jiggered the numbers to make warming appear greater than it has actually been. Another is Tisdale’s clear discussion of the major disagreement between climate models (depicting more warming) and real-world observations (depicting less).

For all concerned about issues of honesty in the climate debates, his post is highly recommended reading.