1 Subjects: “...renewable energy...”

2 Subjects: “...tidal energy...”

3 Subjects: “...energy-efficient home appliances...”

4 Subjects: “...renewable material...”

5 Subjects: “...renewable energy...”

6 Subjects: “...renewable energy...”

7 Subjects: “...renewable energies...”

8 Subjects: “...energy...”

9 “... both living and in waste form and animal waste products. It appears to be a renewable resource because...”