1 Subjects: “...national security...”

2 Subjects: “...national parks...”

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

4 Subjects: “...United Nations Sustainable Development Goals...”

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

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

7 “...According to the Food and Agriculture Organization of the United Nations, one-third of the world...”

8 “... zuviel wie auch zuwenig Umweltschutz sind möglich. Selbst bei national begrenzten Umweltproblemen...”