1 Subjects: “...electricity production...”

2 Subjects: “...human appropriation of net primary production (HANPP)...”

3 Subjects: “...natural products...”

4 Subjects: “...low production...”

5 Subjects: “...silk production...”

6 Subjects: “...silk production...”

7 Subjects: “...productivity...”

8 Subjects: “...productivity...”

9 Subjects: “...productivity...”