State of Our Climate Atmospheric Greenhouse Gas concentrations
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
Oct 2016 Research NOAA Methane emissions from fossil fuels are much higher than current estimates. The post 2007 methane increase is from food production (cows, wetland rice paddies and warming natural wetlands
WMO 2017 GHG Bulletin. Rate of atmospheric CO2 increase is without any known precendent, and all three atmospheric GHG levels increased more than their 10 year annual average.
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 the highest in 5 million years.
Atmospheric CO2 at a 3 million year high, possibly 15-20 million yr high
At over 400 ppm atmospheric CO2 is the highest in 3-5 million years (WMO 2017) Possibly15-20 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
NOAA Annual greenhouse gas Index in 2018Spring 2019 Atmospheric CO2 equivalent for 2017 was 496 ppm