1 Subjects: “...Energy tax / United States...”

2 Subjects: “...Clean energy / Government policy / United States...”

3 Subjects: “...Energy policy / Economic aspects...”

4 Subjects: “...Renewable energy resources / Research / Brazil...”

5 Subjects: “...Energy development / Environmental aspects...”

6 Subjects: “...Biomass energy...”

7 Subjects: “...Renewable energy sources / Economic aspects...”

8 Subjects: “...Nuclear energy...”

9 Subjects: “...Solar energy...”

10 Subjects: “...Energy industries / Law and legislation / China...”

11 Subjects: “...Energy Charter Treaty / (1994 December 17)...”

12 Subjects: “...Force and energy...”

13 Subjects: “...Energy policy / Mexico / History / 19th century...”

14 Subjects: “...Energy policy...”

15 Subjects: “...Renewable energy sources...”

16 Subjects: “...Energy transfer / Textbooks...”

17 Subjects: “...Renewable energy sources / Government policy...”

18 Subjects: “...Energy conservation / Economic aspects...”

19 Subjects: “...Low energy electron diffraction...”

20 Subjects: “...Energy policy / Environmental aspects...”