They underestimate the change. We've already seen this time and time again. Here's another one: The San Francisco Chronicle reports that the "tropical belt" around the earth "seems to have expanded a couple hundred miles over the past quarter century."
Climate scientists have long predicted a growing tropical belt toward the end of the 21st century because of man-made global warming. But what has happened in the past quarter century is larger and more puzzling than initially predicted, said Dian Seidel, a research meteorologist with the National Oceanic and Atmospheric Administration lab in Silver Spring, Md. She is the author of the newest study. "They are big changes," she said. "It's a little puzzling."
But climate scientists Andrew Weaver of the University of Victoria and Richard Somerville of the Scripps Institution of Oceanography said Seidel's work makes sense and that computer models have consistently been underestimating the ill effects of global warming. "Every time you look at what the world is doing it's always far more dramatic than what climate models predict," Weaver said.
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