1 Subjects: “...cross-national case study...”

2 Subjects: “...national parks...”

3 “... at rates unprecedented in human history". Consequently, the United Nations General Assembly recently...”

4 “... that they are treated as a national priority by many countries; several international commissions have been established...”

5 “... and national governments in countries around the world, the integration of VSS in trade policies, the emergence...”

6 “... of energy, geopolitics, and climate policy working on hydrogen in academia, applied research, national...”