VALENCIA, Spain -- They are seen as the gurus of global warming, and their reports are accepted almost as the gospel of climate science. Esteem for the panel of scientists was immortalized when it shared this year's Nobel Peace prize. But experts and the scientists themselves acknowledge the reports are conservative and have a poor track record of predictions.
As the Intergovernmental Panel on Climate Change meets in this Mediterranean coastal city to finish its fourth report in two decades, it must decide whether it will produce a fifth. "Next year would complete 20 years of the IPCC," said chairman Rajendra Pachauri. "That clearly is a point where we should carry out deep and detailed introspection on what we have achieved, what we could have achieved further, and how we might be able to ensure achievement in the future."
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"We need to understand that the worst impacts in the report may not in fact be the worst that will happen, or the worst that appear possible," said Peter Altman, the climate policy project manager for the National Environmental Trust, a Washington lobby. "What's in the report now is scary enough. But in most of the predictions the IPCC has made, just about everything is happening faster and more intensely than we thought," he said. "This issue is not being overstated. If anything, it is being understated."
A joint report this month by two U.S. security institutes said they compared predictions of climate change by the panel and other researchers in the last two decades with changes that actually occurred, and found the scientists had consistently fallen short. Part of the reason was the lack of data, but it also could be that the scientists shied away from controversy and wanted to avoid being discredited as "alarmists," said the paper by the Center for Strategic International Studies and the Center for a New American Security.
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