These days anybody can publish, spreading news and opinion to the world. Meanwhile, holed up in the remaining nooks, crannies and shelters of mainstream media, journalists adhere to their traditional credo: that what they publish should be balanced. That disinterested reporting, a fair shake of the stick to all concerned, is what defines credible media.

But what does that mean? The case de jour, and for that matter of the year, the decade and the century, is climate change. What constitutes balanced reporting?