Increasingly, waste has become a major environmental challenge for humanity. There have been many cases where the impact of indiscriminate waste disposal on the society and the economy has been disastrous. It is not cheap to dispose of waste safely. It would incur high transport and processing costs. The increase in the volume of waste generated by man is not showing any sign of abating. In fact, a major headache for mega cities around the world is the excessive amount of waste generated by city dwellers. The quantities in some cities have reached unmanageable levels. And, the almost unstoppable global trend in rural-urban migration is not helping. There have been occasions when even a brief lull in garbage collection, either because of long holidays or industrial strike actions, has stirred up public anger.
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