Funny. Most weeds were the ancestors of our domestic plants. We made them more useful for us. Agreed, the term weed is used on the plants that we don't wish to have, but I live where every plant seems to be trying to take over the world - aggressively so. Some folks make money over finding something useful to do with it, examples are bamboo, water hyacinth, mesquite...list goes on. Environmental - I think may be the word for xeriscaping plants into areas where they do best. Or weeds, sometimes the same. I see less reason to use tumbleweeds than thistle in a setting.
