What needs more attention: supply, efficiency, environmental protection or infrastructure from the energy system in the next ten years?

Considering the current state of the energy and environmental systems state of well-being in the U.S. and the overall leadership of energy and the environment, which segment of the system (supply, efficiency, environmental protection, infrastructure) needs the most attention in the short term, i.e. the next ten years? What should be done and why?-Work cited page at the end