Okay I help you generate some topics. 
1) Singapore beaches are dirty, people are litering on
beaches.
2) Lack of recycling programs in Singapore. This made us
generate more waste which is not good in the long run. Imagine if
you could recycle cans, papers and glass, it would make our society
a cleaner and greener place to live in.
3) Beach errosion. It's a problem Singapore face and trying
desperately to solve the problem. If you read the news a few days
ago, the government actually planning to build breakwater
stones.
4) Another one is very popular, the flooding problem in
Singapore.
Come back to us when you think of a good topic. I once
taken an environmental project when I was in my poly days, so I can
give you some valuable advice~
