The eco-park receives as many as 1,500 visitors a day. Ecological wastewater treatment isn't limited to small-scale projects. In the United States, subsurface flow systems that service communities of 10,000-20,000 people in Arkansas, Alabama, Louisiana, Kentucky and Florida. Surprisingly, political conservatives have been leaders in adopting these systems, recognizing they're going to save money. Another common stumbling block is that ecological sewage treatment is just too simple.
People tend to undervalue ecology.
But ecological engineering, like constructed wetlands, is the technology for the 21st century. To this end, Nelson sees ecological sewage treatment as a learning tool. Every so often, the closed system of Planet Earth becomes as clear as it was in Biosphere 2. Suddenly, he gets it. I love that.