1. A Hydrogen Strategy for A Climate-Neutral Europe (European Commission, 2020).
2. Biden-Harris administration launches American innovation effort to create jobs and tackle the climate crisis. The White House https://go.nature.com/3us22w0 (2021).
3. The hydrogen stream: projects move forward in China, Japan, Australia and across several European countries. PV magazine https://go.nature.com/3nU7BAT (2021).
4. DOE announces $162 million to decarbonize cars and trucks. US Department of Energy https://go.nature.com/3xUJ17p (2021).