In 2016, Atmospheric CO2 Concentrations Rising At Fastest Rate Ever Seen - Approaching Mid-Miocene

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“The MMCO [Middle Miocene Climate Optimum] was ushered in by CO2 levels jumping abruptly from around 400ppm to 500 ppm, with global temperatures warming by about 4°C and sea levels rising about 40m (130 feet) as the Antarctic ice sheet declined substantially and suddenly. ” — Skeptical Science

Human beings have never seen atmospheric CO2 values that are so high as they are today. They significantly predate our species — even preceding our distant relative Australopithecus by about 7 million years. And weather and climate conditions to which we are not adapted — either as individuals or as a civilizations — are well on the way as atmospheric CO2 levels are ramping up into the lower range of those last seen during the Middle Miocene of 14-16 million years ago at 404 parts per million during 2016.

As we reported in November, 2016 is on track to see a record rate of atmospheric carbon dioxide (CO2) increase. A key heat-trapping gas, CO2 is the primary driver of the big temperature increases seen around the world recently. And with new figures out from NOAA for the month of November, we have a clearer picture than ever of just how unprecedented the jump will be.

For the first 11 months of the year, 2016 atmospheric carbon dioxide concentrations exceeded those of 2015 by an average of 3.45 parts per million. With no sign evident that the pace of increase has slackened — despite a transition to La Nina during the fall — it now appears that the world is set to experience a 3.3 to 3.5 part per million jump in the atmospheric CO2 measure for this year.

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Such rapid rates of atmospheric carbon dioxide increase are primarily caused by global fossil fuel burning — which now produces an emission that is more than 100 times greater than all the volcanoes that erupt across the Earth during any given year. And recent reports have found that US automobile emissions alone equal the amount of carbon dioxide emitted by the Mount St. Helens eruption every three days. This is a heavy insult to the Earth’s climate system. One that is unprecedented for millions of years. All this fossil fuel burning has largely helped to push atmospheric CO2 values for 2016 into an average range of 404 parts per million. This is 124 parts per million higher than the pre-industrial value of 280 parts per million. Meanwhile, peak monthly values during April-May of 2017 could strike as high as 410 to 411 parts per million.

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(15 million years ago, atmospheric CO2 levels in the range of 400-500 parts per million produced Antarctic melt resulting in substantial sea level rise. The above image shows the estimated location of the U.S. eastern coastline at the time. Image source: Colorado Geosystems.)

https://robertscribbler.com/2016/12/08/for-2016-atmospheric-co2-concentrations-are-rising-at-the-fastest-rate-ever-seen/