State of Our Climate
​Atmospheric CO2 Concentration
20 April 2016 Scripps ' Levels exceeded 409 parts per million for the first time in recorded history this month.  

​​NOAA 10 Mar 2016
'Carbon dioxide levels are increasing faster than they have in hundreds of thousands of years. It’s explosive compared to natural processes'. Today’s human-made CO2 increase is 200 times faster, a dramatic rate compared to natural processes, Pieter Tans, leader of NOAA’s Global Greenhouse Gas Reference Network
Preindustrial 
​concentration (WMO)

CO2 278 ppm ​

Dec 2016. Press release and links CO2 rate of atmospheric CO2 increase is unprecedented in Earth history at 3 ppm/year 2015 and 2016.
Atmospheric CO2 concentration history: it is also the highest in 15-20 million years.​
At over 400 ppm atmospheric CO2 is the highest in 15-20 million years
2009 A. Tripati Coupling of CO2 ...  of the Last 20 Million Years 
2013 Yi Ge Zhang A 40-million-year history of atmospheric CO2
CO2 unprecedented rate of increase (WMO 2017)
2018 CARBON DIOXIDE IN THE ATMOSPHERE HITS RECORD HIGH MONTHLY AVERAGE    MAY 2, 2018 Scripps
Abrupt increase of accelerating atmospheric CO2 
Atmospheric CO2
​highest in 3-5 million years
and possibly 15 million years​ 
Abrupt CO2 increase
Accelerating CO2
Why are CO2 emissions highly cumulative in the atmosphere?​