CO2/CH4 ratio (IMAGE)

National Institute for Environmental Studies

CO2/CH4 ratio

Caption

Temporal change in monthly averages of the variation ratio of the atmospheric CO2 to CH4 in January, February, and March observed at Hateruma Island since 1998. The grey thick line represents the smoothed trend curve, and the grey-shaded area represents the 95% range of the variations from the trend curve. The black solid, broken, and dotted lines are the estimated fossil-fuel-related CO2 emissions from China.

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NIES

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