net zero
n.— «Its goal is to take the Casa Grande plant off the power grid, or nearly so, and run it almost entirely on renewable fuels and recycled water. Net zero, as the concept is called, has the backing of the highest levels of corporate executives.» —“In Eco-Friendly Factory, Low-Guilt Potato Chips” by Andrew Martin New York Times Nov. 15, 2007. (source: Double-Tongued Dictionary)