April 2012 CO2 Concentrations: 396.18ppm

Weatherdem's Weblog

The Scripps Institution of Oceanography measured an average of 396.18ppm CO2 concentration at their Mauna Loa, Hawai’i’s Observatory during April 2012.

396.18ppm is the highest value for Aprilconcentrations in recorded history. Last year’s 393.28ppm was the previous highest value ever recorded.  This April’s reading is 2.90ppm higher than last year’s.  This increase is very significant.  Of course, more significant is the unending trend toward higher concentrations with time, no matter the month or specific year-over-year value.

The yearly maximum monthly value normally occurs during May. Last year was no different: the 394.34 concentration was the highest value reported last year and, prior to the past two months, all time.  If we extrapolate last year’s value out in time, it will only be 3 years until Scripps reports 400ppm average concentration for a singular month (likely May 2015).

Judging by the year-over-year increases seen per month in the past 10 years…

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