Ecological Art is generally understood to go even further. There generally are two ways this is done. Some Eco-Artists use art to repair or restore damaged environments, as exemplified by Betsy Damon, who recently gave a talk at UWM about her remarkable work with Keepers of the Waters. Others create work that draws attention to ecological principles or deals with issues related to environmental relationships, sustainability, and the like without affecting them directly. A talk entitled "Preposterous Propositions" at MIAD last night by Linda Weintraub emphasized this last type of approach.
Read my full (and skeptical) review at my other blog: Arts Without Borders.