| Topic | Results |
|---|---|
| Diesel | 1 |
| Din eh | 3 |
| Diplomacy | 6 |
| Direct pipe | 1 |
| Disbursements and reimbursements | 2 |
| Discovered natural gas | 1 |
| Discovered oil | 1 |
| Ditches | 3 |
| Documentation | 8 |
| Dot Lake | 1 |
| Double-acting tankers | 1 |
| Dredging | 49 |
| Dubler, Joe | 1 |
| Dunleavy, Mike | 3 |
| Dust emissions | 2 |
| Eagles | 49 |
| Earthjustice | 2 |
| Earthquakes | 5 |
| East Asia | 12 |
| Ecology | 3 |
