- Clifford Poole
- Clifford von Kuster
- Clifford William Robinson
- Clifton F. Carbin
- Climate
- Climate and Society
- Climate Change
- Climate Change (Plain-Language Summary)
- Climate Change: Suddenly the World Hates Canada
- Climate Clues from Vancouver Island
- Climate Information
- Climate Severity
- Climate Severity Indexes for Selected Places
- Climatology
- Clinton Archibald
