Waste management
As the population rises, consumption of materials rises. Natural waste decomposes gradually, but waste is being added to the environment faster than it can decompose. Its bad smell, pollution and the spread of disease have become a main problem, of cities even more than villages.
Non-decomposing materials — polythene, plastic, batteries, e-waste, electric bulbs and colour-printed paper — are also added all the time. Burning them releases harmful gases such as dioxins; burying them pollutes the soil with heavy metals. People know and understand very little about this. It is essential to realise that a small piece of plastic, a mobile phone battery or a CFL bulb added bit by bit to the environment can cause great harm, and it is everyone's duty to help separate such waste for recycling.
The 4R principle is used in waste management:
Reuse
Use any material or waste again for as long as possible instead of throwing it away after one use — for example, polythene.
Reduce
Keep unnecessary use of materials as low as possible — for example, reduce unnecessary antibiotics and vitamins when there is no illness.
Replace
Use environment-friendly materials instead of harmful ones — for example, organic fertiliser instead of chemical fertiliser.
Recycle
Recycle raw materials, animal waste and waste for use again — for example, making biogas from animal waste, and fuel by recycling polythene and plastic.
Why the order of the Rs matters
Recycling is useful, but it still takes energy to collect, clean and remake materials. Reducing — not buying the extra bag or the needless medicine — saves everything at once. Reusing keeps an object working without any remaking at all. Replacing a harmful material removes the problem at its source. So the best order of thinking is: first avoid waste, then reuse, then choose safer materials, and recycle what is left.
Reuse, reduce, replace, recycle
Waste builds up faster than it decays; the 4R principle — reuse, reduce, replace, recycle — manages it.