As extensions of general circulation models, ESMs include biogeochemical processes, vegetation changes, and human influences to more completely simulate the multitude of factors influencing climate in all its complexity. Accurately predicting future CO2 feedbacks and concentrations is a key objective driving development of ESMs. Central to meeting this goal is a detailed understanding of the global carbon cycle, including how its sources and sinks behave and respond to climatic and atmospheric change.
Credit or Source: Office of Biological and Environmental Research of the U.S. Department of Energy Office of Science. science.energy.gov/ber/
U.S. DOE. 2008. Carbon Cycling and Biosequestration: Report from the March 2008 Workshop, DOE/SC-108, U.S. Department of Energy Office of Science. (p. 19) (website)