When science advances, cities and business enterprises grow in tandem. As human population in cities increases, the amount of waste also increases exponentially. Therefore, we should discover scientific means for properly handling this waste. If not, our natural environment will decay and diseases will spread. We must strive as much as possible to recycle and reuse ‘waste.’ Mother Nature has her own miraculous ways of recycling and reusing waste, thus preserving life. Let it be our aim to create a world with zero waste.