Longman Dictionary of Contemporary English
EXAMPLES FROM OTHER ENTRIES
▪ eco-friendly agriculture
▪ Activist want the government to invest in low-impact eco-tourist facilities.
▪ Officials see a role for sophisticated eco-technology to help eradicate pollution sweeping across the region.
Douglas Harper's Etymology Dictionary
word-forming element referring to the environment and man's relation to it, abstracted from ecology, ecological; attested from 1969.
pre. 1 ecology or the environment (in the ecological sense) 2 economy