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Coppock, Rob, Johnson, Stephanie. "1 Introduction." Direct and Indirect Human Contributions to Terrestrial Carbon Fluxes: A Workshop Summary. Washington, DC: The National Academies Press, 2004.
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FIGURE 1–2 The global biotic carbon cycle. All units in petagrams of carbon per year. Source: Schlesinger (2003.)
FIGURE 1–3 CO2 measured at Mauna Loa Observatory. Source: Keeling and Whorf (2004)