The library IS a good starting point. Repeat after me: library.princeton.edu, library.princeton.edu, library.princeton.edu
No need to Google it.
Let's practice converting a "keyword search" into a search using the "controlled vocabulary" of Library of Congress Subject Headings.
Is "Environmental Justice" a Library of Congress Subject Heading? Is it the best (or only) subject your research needs?
https://catalog.princeton.edu/browse/subjects?q=Environmental+justice