Related Clues:
- Environmental Defense Fund's initial target
- Danger in the water supply, once
- Chemical restricted by the Stockholm Convention
- Once popular insecticide
- Bug-killing ecohazard, briefly
- Greenpeace subj
- Field studying diversity: Abbr
- "Silent Spring" subject
- Killer banned in 1973
- A banned insecticide (abbr.)
- Malaria-fighting compound during W.W. II
- Earth-friendly coll. course
- Prohibited insecticide
- Antimalarial agent
- Banned crop spray