From today's business pages:
This week, as we near the end of a year expected to have been the warmest on record, more than 130 governments and 25,000 officials will meet in Paris to discuss how the rise in temperature can be limited to 2% above pre-industrial levels.
As Stern said, the risks of pushing past 2% to a roasting 4% or 5% are now that much greater and more needs to be done in the coming decades than he expected.
Coming so soon after last week's centrigrade/farenheit debacle, this seems to be turning into something of a specialism for Guardian hacks.