The possibility that our world is moving toward a “greenhouse” future continues to increase as anthropogenic carbon builds up in the atmosphere, providing a powerful motivation for understanding the dynamics of Earth’s past “greenhouse” climates that are recorded in the deep-time geological record. An integrated research program—a deep-time climate research agenda—to provide a considerably improved understanding of the processes and characteristics over the full range of Earth’s potential climate states offers great promise for informing individuals, communities, and public policy.



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