Enter a clue or pattern or both:
The Clue
Environmentalist's activity (9 letter answer)
The Answer
RECYCLING
Tags
Notes
The answer RECYCLING is so rare that it appears less than once every 2500 puzzles.
Definition
RECYCLING as a noun:
1. the act of processing used or abandoned materials for use in creating new products
RECYCLE as a verb:
1. cause to repeat a cycle
2. (recycle, reprocess, reuse) = use again after processing; "We must recycle the cardboard boxes"