WHAT IS 4R principle
@ Prakhar: your friends are correct.
4R principle refers to:
Reduce: As much as possible to decrease the goods or materials that we use.
Reuse: Sort the goods that can be reused.
Recycle: The goods that are not useful anymore can be recycled.
Recover: Check the daily goods carefully. Change the goods that can only be used once with the goods that are more durable.
@ Little_princess_1 and shobit: Good effort! Your answers are really helpful to all the users of this community. Keep writing!!!