a feeling of discontent or covetousness with regard to another's ecological advantages, carbon footprint, greenness, environmental friendliness, etc.
an object of eco-envious feelings: Her new Prius made her the eco-envy of her commune.
Amanda: You know just six months of having solar, and I've saved 4294 lbs of CO2 emissions and produced 2526 kWh!
Damian: Dang girl, I eco-envy your greenness. And my sorry ass only has a solar calculator...