‘A cat in hell’s chance’ – why we’re losing the battle to keep global warming below 2C

A global rise in temperature of just 2C would be enough to threaten life as we know it. But leading climate scientists think even this universally agreed target will be missed. Could dramatic action help?

It all seemed so simple in 2008. All we had was financial collapse, a cripplingly high oil price and global crop failures due to extreme weather events. In addition, my climate scientist colleague Dr Viki Johnson and I worked out that we had about 100 months before it would no longer be "likely" that global average surface temperatures could be held below a 2C rise, compared with pre-industrial times.

What's so special about 2C? The simple answer is that it is a target that could be politically agreed on the international stage. It was first suggested in 1975 by the environmental economist William Nordhaus as an upper threshold beyond which we would arrive at a climate unrecognisable to humans. In 1990, the Stockholm Environment Institute recommended 2C as the maximum that should be tolerated, but noted: "Temperature increases beyond 1C may elicit rapid, unpredictable and non-linear responses that could lead to extensive ecosystem damage."

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