Well, you might want to take a look at the College's strategic plan. Most institutes of Higher Learning have something in their plan about sustainability. This is a relatively low cost program that they can put on their list of accomplishments towards their strategic plan at the next accreitation visit. This is the sort of argument that will persuade University Presidents and Chancellors. Trying to deal with the HR or fiscal office is useless. You might also want to try to get the Faculty Senate to pass a resolution supporting it (even if you aren't on the faculty you can ask them ... faculty generally think of themselves as progressive so it is hard to imagine they will be against this).