SAN FRANCISCO — California’s vibrant clean energy economy is supporting strong job numbers, but failing to deliver more than lackluster annual emissions reductions, as slowing renewable energy growth, underwhelming transportation sector gains, and a worrisome cross-sector overdependence on natural gas pose major challenges for the state.

San Francisco, Calif.—Without urgent water efficiency measures, carbon emissions associated with water usage in California are likely to spike in coming years, as changing sources of water supply and population growth drive up energy-intensive urban and agricultural water needs. Climate change-fueled droughts are likely to further increase water-related energy use and carbon emissions.