Contributing to a green city

Well, I believe that one should also contribute in his/her way at making the earth greener. Some of the ways you can do is:

1. Dont waste water. Plan for rain-water harvesting.
2. Make more use of the public transport.
3. Use solar energy. One of the problem with solar energy is the infrastructure is still costly. I think it should be heavily subsidized.
4. Use hybrid cars, which run on electricity. (When are they coming in India ?!!)
5. Keep thinking of new ways to make earth greener. :)