New Scientist: Can we all stop worrying about global warming? According to a recent rash of stories in the media, the "climate sensitivity" - the extent to which temperatures respond to more carbon dioxide in the atmosphere - is lower than expected, and thus that the world won't get as hot as predicted. One story, in The Economist, based on leaked information from a draft of the next assessment by the Intergovernmental Panel on Climate Change, claims the IPCC will revise its sensitivity estimate downwards when...