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caption: 'The arrows and boxed numbers represent annual fluxes in teragrams (Tg) of CH4 per year estimated from 2000 to 2009 and CH4 reservoirs in Tg CH4. Reservoirs include the atmosphere and three geological reservoirs (i.e., hydrates on land and in the ocean floor and gas reserves). The black arrows show natural emissions, while red arrows show anthropogenic fluxes. The brown arrow represents total anthropogenic and natural emissions. [Figure source: Reprinted from Ciais et al., 2013, Figure 6.2. Copyright IPCC, used with permission.]'
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  doi: 10.7930/SOCCR2.2018.Ch1
  identifier: overview-of-the-global-carbon-cycle
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  report_identifier: second-state-carbon-cycle-report-soccr2-sustained-assessment-report
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  title: Overview of the Global Carbon Cycle
  url: https://carbon2018.globalchange.gov/chapter/1/
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