China has the largest number of journal articles, but it's publication numbers in general across the decade have an almost exponential growth and dwarf all other countries (Figure ). Interest in green hydrogen has surged thanks to China's drive to achieve carbon neutrality by 2060. Some recent real-world examples of China's rising interest in GHE are: the city of Zhangjiakou inaugurating the world's largest electrolyzer for green hydrogen production to provide fuel for hydrogen fuel cell vehicles during the 2022 Winter Olympics; 297 Sinopec, China's largest oil refiner, starting to build the world's largest green hydrogen plant, to be entirely powered by solar; 298 and top Chinese solar manufacturer, Longi Green Energy Technology Co., investing in the production of electrolyzers for green hydrogen production. Though China has yet to introduce a national hydrogen plan, the Chinese Hydrogen Alliance was launched in 2018 by China Energy Corporation and currently has 87 members including universities, research institutions and large companies in the energy production and manufacturing sectors. Japan has had the most patents published throughout the decade (Figure ). Though its patent publications are decreasing yearly (Figure ), the country is investing significantly. The government provided 370 billion yen ($3.4 billion) in funds to research, develop, support and promote hydrogen with 70 billion yen allocated toward hydrogen production via water electrolysis. The interest in hydrogen is also promoted by the Japan Hydrogen Association which includes 274 members between companies, municipalities and universities. 302 Japan promoted this technology thoroughly in the Tokyo 2020 Olympics, where the Olympic cauldron was powered by hydrogen, Toyota provided 500 Mirai fuel cell vehicles and 100 fuel cell buses for transportation, and hydrogen based electricity was used in the Olympic village. Another example is the New Energy and Industrial Technology Development Organization's (NEDO) green hydrogen plant, where 45 acres in Namei are now a solar farm where excess solar power is used for water electrolysis. The United States produced more journal articles than patents, but interest in in GHE decreased slightly throughout the decade (Figure ). Still, we see that GHE publications will increase again because clean hydrogen is crucial to the US Department of Energy's strategy for achieving a 100% clean electrical grid by 2035 and net-zero carbon emissions by 2050, and the recent Bipartisan Infrastructure Law includes: $8 billion for Regional Clean Hydrogen Hubs to expand use of clean hydrogen, $1 billion for a Clean Hydrogen Electrolysis Program to reduce costs of green hydrogen production, and $500 million for Clean Hydrogen Manufacturing and Recycling Initiatives to support equipment manufacturing and strong domestic supply chains. 305 There seems to be a larger academic interest in green hydrogen production due to the large number of journal publications compared to patents (Figure and Table ). Leading the way in number of publications is China, with its top patent assignee being the Dalian Institute of Chemical Physics, a council member of the Chinese Hydrogen Alliance. This aligns with the recent surge in interest of the solar and oil refining industries of China to build large electrolyzers and green hydrogen plants. The United States places second in number of publications, mostly in journals, followed by Korea and Japan. Table also demonstrates that no US based company in the top assignees have patents, though Japan's Toyota and JX Nippon Oil & Energy Corporation are tied for the second highest number of patents.