The 4R principle to save environment from pollution are:
∙ Reduce - Minimal use of resources to reduce the amount of waste produced from it
∙ Reuse - Use the resources again instead of throwing them away after single use
∙ Recycle - Most materials can be recycled into another form instead of dumping them after use
∙ Recover - Reclaiming the materials helps to process them and make use of them elsewhere
So, reduce is one of measures in 4R principle which indicated to use the resources less.