Crossword Genius

Earth-friendly prefix (3)

Ross

I believe the answer is:

eco

'earth-friendly prefix' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in the USA Today, the Newsday, The Wall Street Journal, The New York Times, the LA Times and the Universal.
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