Check out environmental studies at STEM universities:
See:
MIT @ https://ocw.mit.edu/courses/economics/14-42-environmental-policy-and-economics-spring-2011/
Cornell @ https://www.cornell.edu/search/?q=eviromental+economics&submit-search=
Be careful as Agricultural Economics are more directed toward agricultural application. Find a quality university where quantitative theory can take one many directions and which can offer expertise in these different applications. Civil Engineering, Life sciences, as well as related quantitative methodologies may be of interest here. See https://www.wpi.edu/academics/study/economic-science-bs
Look for flexibility and a breadth of related offerings.
By the way, if it was not economics… what would you study?