Environmental System Science ProgramThe Environmental System Science (ESS) program advances an integrated, robust, and scale-aware predictive understanding of terrestrial systems and their interdependent biological, chemical, ecological, hydrological, and physical processes. ESS is part of the Earth and Environmental Systems Sciences Division (EESSD) within the U.S. Department of Energy’s Biological and Environmental Research (BER) Program. The ESS program seeks to develop an integrated framework using a systems approach to elucidate the complex processes and controls on the structure, function, feedbacks, and dynamics of terrestrial ecosystems that span from the bedrock through the rhizosphere and vegetation to the atmospheric interface.