I don't know the specifics of Yale's Econ and Environmental Engineering majors, but Dartmouth has exceptional economics, and super strong earth sciences, so you could do engineering modified with EARS
https://engineering.dartmouth.edu/undergraduate/ab/majors/modified/environmental-science
Dartmouth Engineering
Students interested in environmental engineering may pursue the engineering sciences major modified with environmental sciences. Students who plan to pursue additional coursework beyond the AB to earn the Bachelor of Engineering (BE) should consult early with their faculty advisors to plan their…