For nearly half a century the climate computer models have said that if you want to see warming, look at the "Tropical Troposphere," the portion of the atmosphere above the very bottom but below the stratosphere, and the part of it over the tropics. But as Dr. John Robson explains in this Climate Discussion Nexus "Crystal Ball" video, actual measurements, by balloons and satellites, consistently show there's far less warming there than predicted. And while activist scientists say never mind the data, the theory must be right, we say if the facts don't fit the prediction, the hypothesis is refuted.

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