Read, enjoy and critique one of the classic papers that form the basis for environmental thinking from this list:
Leopold "Sand County Almanac"
Wilson "Biophilia"
Bateson "Mind and Nature"
Thoreau "Walden"
Schumacher "Small is Beautiful"
Tuan "Topophilia"
The hardest task in this paper is to compare points from Speth or Norton to your "Classic". You can start this by looking for references to your chosen text in the index of Speth and Norton.