The Barcelona Challenge presents metrics, in the form of a toolkit, to help grasp the positive impacts the commitment to action could entail in practical terms for engaged cities, their citizens and the climate.

This toolkit can be used to estimate the projected magnitude of the reduction of GHG emissions of the food policies adopted by cities committed to the Challenge, based on the current conclusions established in international scientific research. The toolkit also enables the user to estimate other multi-dimensional benefits (socio-ecological benefits and economic returns) of adopting specific actions to deliver healthy and sustainable diets for all.