Paryavaran.com-Gateway to Indian Environment Market
I can think of a few difficult topics and both are relevant in their own ways
1. The Amount of water a river carries in different seasons-estimation what adds and what prevents.
2. Ground water recharge for a given area-again how to increase/decrease
3.Solid waste disposal-better ways to manage the ever growing heap.
4.Reduce Air Pollution -ways.
You can opt for some of the following problems ifyou choose:
1.Seasonal pollution loads and primary production assessment of rivers or major streams of your locality.
2. Hazardous waste estimation, collection, recycling and management procedures of your city or district with temporal data
3, Electronic waste management survey in the light of case studies.
4. Flood and climate studies in relation to land changes or river/stream diversions.