|
| Cabot Oil & Gas (1) | CalFrac Well Services (1) | Canham, Charles (1) |
| Carlsen, Laura (1) | Carnegie Mellon (1) | Carroll, Joe (2) |
| Caruso, David (1) | Cary Conference (1) | Casey, Robert (1) |
| Casey, Tom (1) | Casselman, Ben (1) | Cassin, Richard L. (1) |
| Catskill Citizens for Safe Energy (1) | Catskill Mountainkeeper (1) | Center for Dark Energy Biosphere Investigations(C-DEBI) (1) |
| Center for Public Integrity (1) | Ceres (1) | CHE | Collaborative on Health and the Environment (1) |
| Chesapeake Energy (1) | Chevron (1) | Chief Oil & Gas (1) |
| Christopherson, Susan (1) | Citizens Campaign for the Environment (1) | City of New York (1) |
| Clean Water Action (2) | Clean Water Not Dirty Drilling (1) | CleanWaterActionPA (1) |
| Clem Guttata (1) | Climate Ground Zero (1) | coalrivermtnwatch (1) |
| Coffman, Steven (1) | Cohen, Dave (1) | Colborn, Theo (1) |
| Colburn, Theo (1) | Cole, John (1) | Colorado School of Mines (1) |
| Common Cause Pennsylvania (1) | Commonwealth of Pennsylvania, Department of Environmental Protection(DEP) (1) | Commonwealth of Pennsylvania DEP (1) |
| Conoco Phillips (1) | ConserveLand (1) | CONSOL Energy (1) |
| Consortium for Materials Properties Research in Earth Sciences(COMPRES) (1) | Cooke, Claude E. (1) | Copithorne, B. (1) |
| Cornell Cooperative Extension(CCE) (1) | Cornell Daily Sun (1) | Cornell University (2) |
| Cornell University Law School (1) | Cortland County Clerk (1) | Covalent Energy (1) |
| Coyle, Marcia (1) | CPNY (1) | Craig (1) |
| Cryderman, Kelly (1) | Cusolito, Kara (1) | |