The U.S. Carbon Cycle Science Program (US CCSP) is a federal multi-agency research program established under US Global Change Research Program (USGCRP) auspices in 1999. It incorporates broad coordinated community input such as from the U.S. Carbon Cycle Science Plans (1999, 2011). Researchers and program managers have been using the 2011 Plan to expand and enhance our understanding of the carbon and pertinent biogeochemical cycles across land, water, air and society from local to regional to global scales. Once such program, the North American Carbon Program (NACP) is a multi-agency, multidisciplinary community of practice focused on understanding carbon sources and sinks in North American and adjacent oceans. As a core program of the US CCSP, NACP has recently developed a Science Implementation Plan to inform research, scientific collaboration, and syntheses across 5 program elements: sustained and expanded observations; assessment and integration; processes and attribution; prediction; and communication, coordination, and decision support. In this open forum, we will discuss and seek community input on research progress since 2011, the new NACP Science Implementation Plan, and the broader decadal strategic planning vision of the US CCSP. Pertinent U.S. research funding programs, observation networks and coordination capabilities and opportunities across agencies and internationally will also be discussed. US Carbon Cycle Science Program North American Carbon Program