Atmospheric CO2 concentration is the world’s leading risk indicator.
As reported in my previous post, details of the December 2012 data release for atmospheric CO2 concentration in parts per million at the Mauna Loa Observatory in Hawaii are as follows:
- December 2012 = 394.39 ppm, +2.60 ppm year-on-year
- Twelve Month Average = 393.84 ppm, +2.19 ppm year-on-year
- Twelve month average over pre–industrial level = +40.7%
The current trajectory in atmospheric CO2 concentration rise coupled with the fact that no global agreement has been reached to reduce CO2 emissions mean that the world’s average temperature is likely to rise within the range described by the left-hand ‘no policy’ roulette-style wheel (click for larger image) as developed by the Massachusetts Institute of Technology (MIT) Joint Program on the Science and Policy of Global Change.