1 Subjects: “...carbon cycling...”

2 Subjects: “...hydrosocial urban cycle...”

3 Subjects: “...nitrogen cycling...”

4 Subjects: “...life cycle...”

5 Subjects: “...nutrient cycling...”

6 Subjects: “...product life cycle cost...”

7 Subjects: “...marine geochemical cycle...”

8 “... climatic cycles, water availability, wildlife, vegetation, and fire have shaped the possibilities...”