1 Subjects: “...zero carbon...”

2 Subjects: “...consumer low-carbon preference...”

3 Subjects: “...low carbon cities...”

4 Subjects: “...multi- walled carbon nanotube...”

5 Subjects: “...karst carbonate reservoir...”

6 Subjects: “...carbon emission...”

7 Subjects: “...carbon footprint...”

8 Subjects: “...carbon footprint...”

9 Subjects: “...carbon emission...”

10 Subjects: “...low-carbon economy...”

11 Subjects: “...carbonate geothermal reservoirs...”

12 Subjects: “...carbon emission...”

13 Subjects: “...carbon emissions...”

14 Subjects: “...continuous carbon fiber...”

15 Subjects: “...continuous carbon fiber...”