I don't know if you remember my friend Amy Seidl coming to talk a few years back about climate change (she has a book coming out soon on the topic) -- but she is Associate Director of LivingFuture, which is based on Teal Farm in Vermont.
Might be an interesting place for your students to see what money can do regarding sustainable ag/energy. The farm is meant to be a model of complete sustainable energy and a working research farm.
Thought you might be interested.
Check out the YouTube segment on the link below.