I'm not aware of a generally accepted definition. It may exist.
I am not a biologist; I have to say that I am an economist. If you were to take my advice on biology, you would be poorly served.
We interest ourselves in these issues as an organization. We speak a little bit in the written document to the kinds of things we think should be pursued in the context of ecological health—restoration of river systems and their banks, the reintroduction of plants and trees, and the removal of invasive species from national urban parks.