What would that big of a temperature leap do to the planet? Earlier this year, Climate Progress’s Joe Romm put together an excellent post going through the scientific literature on likely impacts from the IPCC’s worst-case emissions scenario. We’d be facing much higher land temperatures — as much as a 5.5°C (10°F) rise in parts of the United States — plus a six-foot sea-level rise by 2100, along with large species loss, many more extreme weather events, and a big hit to the world’s food supply. Arctic temperatures could rise as much as 11°C (20°F), which would, among other things, speed up the melting of Greenland’s ice sheet.
In any case, you can pick through the Energy Department’s emissions data here. About 41 percent of the carbon increase last year came from China, with 12 percent of the leap coming from the slowly recovering U.S. economy (overall U.S. emissions, however, are still lower than they were before the financial crisis).
Interestingly, as the AP’s Seth Borenstein points out, there does seem to be one small bright spot. The developed countries that ratified the 1997 Kyoto Protocol (not including the United States) have managed to cut their carbon-dioxide emissions and are on pace to meet their goals of an 8 percent cut below 1990 levels. But I’d advise caution here: There’s growing evidence that many European nations have been “outsourcing” their emissions to countries like China, and when those embedded emissions from imports get factored in, Europe doesn’t look quite as virtuous. But that’s another reminder that any attempt to tackle global warming has to be, well, global.