Unit Title	Author
2010
Global Warming in the City: Unit for the Greenhouse Effect	Deborah Smithey
Keywords: city, global warming, greenhouse effect, public housing, subsidized housing
Energy Eaters and Energy Feeders	Nicole Haentjens Traore
Keywords: alternative energy, energy, power
2006
The Disappearance of Sherwood Forest: The History of Cobbs Creek in Philadelphia	Patricia Blakeney-Whack
Keywords: Cobbs Creek Parkway, Ecology, Environmental Science, pollution, Preserving the Environment, Watershed, West Philadelphia