Ecology or the environment (in the ecological sense)(prefix)
Economy(prefix)
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Use "eco-" in a sentence
"Engage the staff: Global Action Plan in the U.K. has devised a racing game called the eco- driving simulator that prompts people to drive in an environmentally-friendly way."
"Californians are known for their discerning taste and deserve the right to continue to be eco- and health- conscious "foodies.""
"Speaking of eco- and socially-conscious yes, this is going to be a shameless plug for my eco-friendly and carbon natural spirits brand VeeV, this week VeeV Açaí Spirit is partnering with Bette Midler's New York Restoration Project to support the non-profit's MillionTreesNYC program with a special reception on the 21st."