State of Our Climate
Atmospheric Greenhouse Gas Concentrations
CO2 278 ppm
Methane 722 ppb
Nitrous oxide 270 ppb
Atmospheric GHG concentrations tell us what the future higher 'committed' (locked in) global warming is.
It is about another 70% of global temperature increase (IPCC AR5)
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.
Global Carbon Budget
Dec 2016 Methane Budget
ate of atmospheric CO2
increase is unprecedented in Earth history
at 3 ppm/year 2015 and 2016.
Atmospheric CO2 concentration
it is the highest in 5 million years.
Dec 2016 GRL
Methane radiative heat forcing is 25% higher.
Nov 2016 Nonlinear climate sensitivity
Climate sensitivity to CO2 X2 is 4.88C (likely range, 4.29 to 5.44C per CO2 doubling for warm phases (as now).
Very Strong Atmos Methane Growth FEEDBACK
Copernicus CAMS atmospheric satellite
Trends in global CO2 and total greenhouse gas emissions
PBL Netherlands Environmental Assessment Agency
NOAA Greenhouse gas Index CO2 equivalent (includes other GHGs) 500 ppm
NOAA Atmospheric GHG trends
Global Carbon Project CO2
Global Carbon Project Methane
Global Carbon Project Nitrous Oxide