1 Subjects: “...national nature reserve...”

2 Subjects: “...National Parks...”

3 Subjects: “...National Centers for Environmental Information...”

4 Subjects: “...national parks...”

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

6 Subjects: “...national ambient air quality standards...”

7 Subjects: “...national sustainable development plans...”

8 Subjects: “...national and global efforts...”

9 Subjects: “...national health insurance...”

10 “... published by MDPI on the topic. It highlights the most recent internationally/nationally funded projects...”

11 “...) of the United Nations Economic Commission for Europe (UNECE)....”

12 “... is of great importance for the optimization of national space. The book mainly focuses on functional...”

13 “... Development Goals (SDGs) set by the United Nations (UN). There are lots of challenges to developing modern...”

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