1 Subjects: “... nation...”

2 Subjects: “...marine national park...”

3 Subjects: “...Chinese national scenic areas...”

4 “... that can be implemented in national, regional or even local energy systems at different implementation...”

5 “... and exploit the deposit. The continuous development of national economies is related to the increasing demand...”

6 “... inhabitants. The United Nations World Water Development Report, 2018, warned that by 2030, the global demand...”