Figure 1: Overview of the path to closed loop energy carriers for CREST Hub. Initially, CREST will improve sustainability, and secondly reduce reliance on the initial production component in purple. Finally, CREST will target increased the circularity of these energy carriers (right). For example, the lithium used in batteries will be harvested in a cleaner fashion, and ultimately recycled from end-of-life electric vehicles. Hydrogen will be moved globally through green ammonia, and safely deployed into fuel cells to convert into electricity.