Last week we learned that maybe, just maybe, global carbon emissions were flat in 2014 even though the global economy supposedly grew by 3 percent. As Brad Plumer of Vox (whose work I greatly respect) points out, carbon emissions have moved up almost in lockstep with economic growth for the entire industrial age except during recessions and one year of growth 40 years ago.
This is why I use "supposedly" when referring to the global economic growth number. It's because there is another obvious and plausible explanation for the flat carbon emissions, namely, that the global economy did not grow by the stated percentage, that it may have grown only a fraction of that amount or not at all.
Economic measures are constantly being revised, and I think it is very likely that the global economic growth number for 2014 will be revised downward. Probably not to zero, but downward nonetheless. It's also possible that estimates of carbon emissions are too low. Plumer cites "notoriously unreliable" Chinese emission numbers as one reason to be skeptical.