The fact that the world’s largest energy consumer and emitter, China, could eliminate its energy-related air pollution- and climate-relevant emissions by 2051 due to its rapid pace of WWS deployment should give hope to the world. The fact that China is already producing so much WWS electricity that it may supply, in 2025 ∼54% of what the U.S. needs in 2050 to go 100% WWS across all energy sectors, indicates there is no technical or economic barrier stopping the U.S. from reaching 100% WWS either. Because seven countries are further ahead than China in the transition, there is hope for other countries as well. These results suggest that the main barriers to a transition in any country are generally not technical or economic, but social and political.