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How carbon was incorporated into the Earth and evolved to its present concentration in the modern mantle was the focus of the special session, The Carbon Geodynamic Cycle, convened at the 1990 Spring AGU Meeting in Baltimore, Md. Thirteen talks in the session covered a wide range of topics that included terrestrial accretion of carbon, carbon-isotopic composition of diamonds, magma degassing and the relationship of carbonate sedimentation to the global carbon cycle.