Saturday, February 24, 2018

Global CH4:: Decadal Methane Increase Above 70 ppb.

NOAA ESRL published the November, 2017 global methane (CH4) concentraion data on February 5, 2018. Once again we established a record high as atmospheric methane hit its annual peak. 


Last November's concentration was 8.9 ppb above November, 2016, continuing the higher trend after a brief slowdown in early 2017. It is sobering to realize that global CH4 has increase over 13% since November, 1983. There is no slow down in its annual increases since 2007.

Additionally, the rate of concentration increase has not continued to drop after the last El Nino, but is sustained above 7 ppb annually for the last 10 years. While the November, 2017 reading was 8.9 ppb above 2016, it is 43.9 ppb more than November, 2012, and over 70 ppb higher than November, 2007.

Even more sobering is being reminded once again that we live in a 250% higher global methane concentration since pre-industrial(assuming 725 ppb in 1750-1800). 

We also live on a planet, that based upon ice core data, has a higher atmospheric methane (CH4) concentration than at any time in the last 800,000 years.
Source: EPA

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