Clue: Tree hugger's subj.

Answer: ECOL

Length: 4

---

Similar Clues:

• Tree-hugger's subj. (ECOL with 4 letters)
• Family tree subject (ANCESTRY with 8 letters)
• Kindergarten subj. (ABCS with 4 letters)
• Silver-leaved tree (ABELE with 5 letters)
• 1972 treaty subj. (ABM with 3 letters)
• Subj. of a 1972 treaty (ABM with 3 letters)
• SALT subj. (ABM with 3 letters)
• Subj. of a 1972 USA-USSR treaty (ABM with 3 letters)
• Nixon treaty subj. (ABM with 3 letters)
• Subj. of a 1972 defense treaty (ABMS with 4 letters)