Environment Counts | WMO reports atmospheric CO2, CH4, N2O reach new highs in 2012 :

Published by on Tuesday, January 24th, 2017

Published
by geoff
on 2013-11-07

The latest observation from the WMO Global Atmosphere Watch (GAW) Program shows that CO2, CH4, and N2O concentrations continued to increase from 2011 to 2012.

GHG	CO2(ppm	CH4(ppb)	N2O(ppb)
Global abundance in 2012	393.1ppm	1819ppb	325.1ppb
2012 abundance relative to 1750	141%	260%	120%
Increase 2011-2012	2.2ppm	6ppb	0.9ppb
Mean annual increase during last decade	2.02ppm/yr	3.7ppb/yr	0.80ppb/yr

Radiative forcing 1979-2012

The NOAA Annual Greenhouse Gas Index shows that from 1990 to 2012 radiative forcing by long-lived greenhouse gases increased by 32%, with CO2 accounting for 80% of this increase.
WMO Greenhouse Gas Bulletin 6 Nov 2013

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