1 Subjects: “...national park...”

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

3 Subjects: “...National Health and Nutrition Examination Surveys...”

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

5 Subjects: “...National Health Services...”

6 Subjects: “...Manu National Park...”

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

8 Subjects: “...national park...”

9 Subjects: “...National Health Service (NHS)...”

10 Subjects: “...national parks...”

11 Subjects: “...national health system...”

12 “.... The United Nations Climate Change Panel has urged the consideration of the agricultural practices...”

13 “... in socio-economic dimension, urbanization etc.), in the urban space particularly in developing nations...”