The Global Carbon Project (GCP) studies the integrated picture of the carbon cycle and other interacting biogeochemical cycles, including biophysical and human dimensions and their interactions and feedbacks. The broad objective is covered by three themes: a) Diagnostics – Patterns and variability of natural and anthropogenic carbon sources and sinks; b) Vulnerability – Processes and feedbacks of the biophysical-human system; and c) Low Carbon – Carbon management and policy.