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Published online 29 March 2007 | Nature | doi:10.1038/news070326-11
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When it's right to be reticent
The caution of climate scientists is commendable even if caution is out of fashion, says Philip Ball.
Jim Hansen is no stranger to controversy. Ever since the 1980s he has been much more outspoken about the existence and perils of human-induced climate change than most of his scientific colleagues.
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