The Ministry of the Environment, Japan (MOEJ), National Institute for Environmental Studies
(NIES), and Japan Aerospace Exploration Agency (JAXA) have been monitoring carbon dioxide (CO2)
and methane (CH4) by the Greenhouse gases Observing SATellite "IBUKI" (GOSAT).
A recent provisional analysis of GOSAT observational data shows that the global atmospheric monthly
mean CO2 concentration observed vertically through the whole atmosphere exceeded 400 ppm in
December 2015 for the first time since GOSAT was launched in 2009.
Full text here (PDF)
Whole-atmosphere mean CO2
