About time we revisited the Big Number which sits on the right side of my blog: the atmospheric concentration of CO2. I dub this “the most important risk indicator in the world” since it will have a greater impact on humanity than anything else I can think of (barring the earth getting hit by a stray astroid or such).
The monthly average is back over 400 parts per million (ppm) as of February. As a reminder, the cyclicality is a result of the northern hemisphere (which accounts for 65% of global land mass) plant growth and decay cycle. Source for the two charts below: NOAA (click for larger images).
The annual average year-on-year continues to grind up despite the fact that the first United Nations Climate Conference of Parties (COP) took place back in 1995.
COP 21 will take place in Paris this December, yet the above chart demonstrates that little progress has been made in mitigating carbon emissions.
In a blog post I wrote three years ago called “A Fraction for Your Thoughts” I highlighted a hidden risk contained in the above chart: the stability of the carbon sink and source relationship. As you can see from the chart below taken from the Global Carbon Budget 2014 (click for larger image), only a portion of emissions remain in the atmosphere. Continue reading