If my friend has a habit of littering streets ,i would tell her about what actually she is doing harm to the environment.her little actions contribute and make her surroundings unfit for her daily activities and will also harm others genuine behaviour. I will also tell her about the swachh Bharat Abhigyan which was organised recently.i will tell her about the success it was gifted with and the initiative too.i will her that my hopes are with her and she would surely overcome her littering habit.