"Contraction and Convergence' (C&C) is the science-based, global climate-policy framework, proposed to the United Nations since 1990 by the Global Commons Institute (GCI). The objective of safe and stable greenhouse gas concentrations in the atmosphere and the principles of precaution and equity, as already agreed in the UNFCCC, provide the formal calculating basis of the C&C framework that proposes: A full-term contraction budget for global emissions consistent with stabilising atmospheric concentrations of greenhouse gases at a pre-agreed concentration maximum deemed to be safe, following IPCC WG1 carbon cycle modelling. The international sharing of this budget as