Crossword Genius

Prefix suggesting conservation (3)

Ross

I believe the answer is:

eco

(Other definitions for eco that I've seen before include "Concerned with the environment" , "Umberto -, Italian author (The Name of the Rose)" , "Umberto - - , novelist" , "Umberto --, Italian writer" , "Environmental group" .)

I've seen this clue in The New York Times.
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