When I was reading about your interests, the first school that came to mind was SUNY ESF. Obviously, I wasn’t the only one. 
Something to note is that students can cross-register for classes at neighboring Syracuse, so there’s a wide range of additional courses available, all while paying the SUNY price. As a FGLI student, I would expect that there are special grant programs that would significantly defray the costs of a SUNY degree.
Speaking of SUNY campuses, there are some others you may want to investigate.
SUNY - Brockport is mid-sized with about 5400 undergrads, and has a number of offerings that could be of interest such as majors in climate studies, environmental science (including an option to accelerate and get a Master’s in Ecology), sustainability, and water resources, among others. Here are some examples of undergrads doing environmental science research at Brockport.
SUNY - Plattsburgh: There are about 3900 undergrads at this school with a number of majors like ecology, environmental science, environmental planning and management, environmental geology, etc. There are also an array of facilities and field sites (including one that’s over 8k acres) for environmental research.
I think that you would be an extremely likely admit for any of these SUNY campuses.
A more selective school that might be of interest is U. of Rochester (NY). It has a very open curriculum, like Brown where you’re thinking of EDing. It too has a number of majors and minors that could be of potential interest. I think Rochester would either be a toss-up or likely admit for you.