Below is a list of call number ranges that you may find helpful for your sustainability research.
GE25-35: Communication in Environmental Sciences
GE42: Environmental Ethics
GE50-56: History of Environmental Sciences
GE70-90: Environmental Education, Study and Teaching
GE105: General Works
GE123: Handbooks, Manuals, etc.
GE140-146: Environmental Quality and Degradation
GE149-160: Global Environmental Change
GE170-199: Environmental Policy
QC882-994: Atmospheric Pollutants & Greenhouse Effect, Global Warming
QE38: Environmental Geology
QH72-77: Nature Conservation, Landscape Protection
TD169-1066: Industrial Environmental Protection and Control
These reference books are great starting points; most of them are non-circulating without special permission, so they stay in the library.