4C aims to synthesise and disseminate its scientific findings to foster a broader understanding of climate-carbon interactions and accurate interpretation in support of scientific assessments and policymaking. The results will also be communicated to a broader audience and the general public. Knowledge transfer concerning our improved understanding of the human perturbation of contemporary carbon cycle will be facilitated. The aim is to improve our understanding of the near-term evolution of the carbon cycle and how it would respond to near-term emission mitigation, as well as our understanding of the Earth System, accounting for climate and carbon cycle feedback in the context of the long-term ambitions of the Paris Agreement. We will focus on knowledge transfer to support major international scientific assessments, provide added-value to decision and policymakers.