Participants might want to look up on the following lines to address the issues:
1.Look up for the power cuts and power requirements per day in the given city
2.Find out the type and number of vehicles that run on the roads and analyse the subsequent impacts on the environment in terms of maybe pollution
3.Look up for the type of waste generated mainly by Residential and industries.Decide upon strategies of recycling or reusing them or efficient ways of disposal
4.Check the water availability and scarcity present in the city. Discuss upon ways to tackle that
5.Investigate on the present methodologies and materials used for construction. Work on lines like for example designing building with materials that provide heating or cooling depending on external condition (Just an example to guide, you might want to look up for more innovations).
For information regarding power cuts, water scarcity look into newspaper article and magazines and forum where in such issues are discussed.
Sample abstract can be downloaded here.
The entire details for Greenville can be downloaded here