The University of Richmond has excellent Bio department and environmental studies program, and It does offer 45ish full tuition/full ride scholarships to freshmen each year, but is has become much more selective in recent years. When my oldest daughter, UR class of 2016, applied back in 2012, the admissions rate at UR was around 40%, this year, it was 31%, and the test scores and stats of students have risen a lot, too.
A 33 ACT is now at the 75%ile for admitted students, and may not be high enough for their bigger awards, although the scholarships are split up by interest area(science, arts/theater/music, leadership, etc), and average scores will vary by interest area. It is entirely possible to major in the sciences as well, getting the scholarship in the arts area(winners must major or minor in the arts area). The science scholarships are very competitive, and a 33 ACT may not be high enough without a hook of some kind. There are some other smaller merit scholarships available, but they may not get you to the price tag you need.
UR does give very generous need based aid, meeting 100% of demonstrated need(they are a CSS profile school).
A friend’s daughter recently graduated from Ursinus College in PA, with a degree in environmental science, she is happily working on a farm in Vermont and loved her time at Ursinus. If you like smaller schools, it may be a good bet. It is one of the Colleges That Change Lives (CTCL) schools, and they offer good merit aid; your scores are probably more competitive for merit aid there.