For most topics, you will need to browse the reference section. Browse by Dewey numbers:
363.7 Environmental Topics (pollution, global warming etc.)
550 Earth Sciences
580 Plants
590s Animals
630s Agriculture
The 363.7 Reference Section is on the low reference shelf opposite the photocopier.
The 500s - 600s Reference Section is on the tall reference shelf opposite the book drop.
Specialized Refernce Articles can be found in: