There are 4 R's which are necessary for the protection and conservation of the environment. The 4 R's are reduce, reuse, recycle and recover. Reduce the amount of wastes which is produced. Reuse the materials by modifying them if they can be used. This will reduce the amount of wastes which will be generated. Recycle the wastes and use the recycled forms of wastes. Recover the maximum from the wastes after recycling to generate less amount of wastes.