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<https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/observations-of-atmospheric-carbon-dioxide-and-methane/figure/global-monthly-mean-methane-and-carbon-dioxide-concentrations-and-global-annual-emissions-of-ch4-and-non-fossil-fuel-annual-emissions-of-co2->
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   gcis:figureNumber "8.1"^^xsd:string;
   dcterms:title "Global Monthly Mean Concentrations of Methane (CH4; red line) and Carbon Dioxide (CO2; blue line) and Global Annual Emissions of CH4 (red bars) and Nonfossil Fuel Annual Emissions of CO2 (blue bars)"^^xsd:string;
   gcis:hasCaption "Global CH4 and CO2 concentrations\r\n(in parts per billion [ppb] and parts per million\r\n[ppm], respectively) are from the National Oceanic and\r\nAtmospheric Administration’s Marine Boundary Layer\r\nproduct. Methane emissions were generated from annual\r\ngrowth rates of marine boundary layer CH4, assuming\r\na CH4 lifetime of 9.1 years. Carbon dioxide emissions\r\nwere generated from annual growth rates of marine\r\nboundary layer CO2, converted to emissions using a\r\nfactor of 2,128 teragrams of carbon (Tg C) per year per\r\nppm and removing anthropogenic fossil fuel emissions.\r\nFrom 1980 to 2016, these global fossil fuel emissions\r\ngrew steadily from about 5,000 Tg C per year to about\r\n9,200 Tg C per year (Boden et al., 2017). Dotted vertical\r\nlines in 2007 and 2016 represent approximate reference\r\ntimes for publication of the first and second State of the\r\nCarbon Cycle reports."^^xsd:string;
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## Geographical extent of the figure content

## Temporal extent of the figure content
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## Person and his/her role in the creation of the entity:
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