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

2 Subjects: “...National Parks...”

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

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

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

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

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

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

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