| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how have humans changed the carbon cycle | 1.93 | 0.6 | 3743 | 1 |
| how are humans altering the carbon cycle | 1.04 | 0.3 | 2387 | 36 |
| how do humans alter the carbon cycle | 1.34 | 0.6 | 5385 | 91 |
| how have humans impacted the carbon cycle | 1.45 | 1 | 9502 | 76 |
| describe how humans impact the carbon cycle | 1.94 | 0.7 | 9697 | 100 |
| how have humans affected the carbon cycle | 1.03 | 0.3 | 2630 | 35 |
| how do humans influence the carbon cycle | 0.19 | 0.4 | 8302 | 44 |
| how are humans impacting the carbon cycle | 1.29 | 0.9 | 3277 | 70 |
| how are humans affecting the carbon cycle | 0.74 | 0.7 | 6085 | 77 |
| how does humans affect the carbon cycle | 0.19 | 0.1 | 5875 | 19 |
| how are humans influencing the carbon cycle | 0.23 | 0.6 | 4076 | 62 |
| how do humans impact the carbon cycle | 0.96 | 0.4 | 3000 | 15 |
| ways humans alter the carbon cycle | 1.46 | 0.4 | 775 | 85 |
| two ways humans impact the carbon cycle | 2 | 0.9 | 6587 | 95 |
