POCACITO facilitates the transition of EU cities to a forecasted sustainable or "post-carbon" economic model. The project focuses on towns, cities, megacities, metropolitan areas and urban clusters larger than 1 million people as well as small and medium-sized cities. This document details the completion of Leading Cities Inventory (D2.1). Although a stand-alone deliverable, it can be viewed primarily as an interim result and internal knowledge base for the project.