Filed from 2 published puzzles

ECOSYSTEM

Set to 2 different clues across 2 published puzzles, most often “Biodiversity setting” — The New York Times, Friday, 26 February 2010.

9 letters

Every clue on record, most used first

Biodiversity settingonce
The New York Times — Friday, 26 February 2010
Environmentalist's concernonce
The New York Times — Saturday, 8 November 1997

Other answers to these clues

ACIDRAIN8 letters