Indiana has a really well-regarded School of Public and Environmental Affairs. I personally know about it more for its graduate programs, but I am sure it would also be a great place to go for college–they actually have three majors related to Environmental issues:
The other university I thought of–which is technically a public but actually very similar in feel to a lot of the privates on your current list–is William & Mary. They are generally a very well-regarded public policy college, and then they have an interdisciplinary Environment & Sustainability major (you will also have a primary major in something else, which could be Public Policy or indeed something different), within which you can choose the Policy track:
Edit: I didn’t know this until I looked it up, but the Maxwell School of Citizenship & Public Affairs at Syracuse, another extremely well-regarded public policy school, offers a similar sort of secondary major in Environment, Sustainability, and Policy: