Currently the CESM components have both an MCT and an ESMF interface to the driver set by the XML variable COMP_INTERFACE=[MCT, ESMF] in env_run.xml.CESM2.0 will discontinue support of the ESMF option in the component interfaces to the driver. New and improved ESMF/NUOPC capabilities will be brought in sometime after the CESM2 release.This decision was made after surveying the development community on their use of this option.