My six year old neighbor asked me why she should not bathe in the tub every day. There is so much water on Earth, she rationalized. Her teacher had recently taught her in school that most of the Earth was filled with water. Samuel Taylor Coleridge answers her innocent question best. “Water water everywhere, not any drop to drink.” It seems like just one drop, but it will soon fill a bucket… ( Suggested Graphic: shutterstock.com) It is true, of course, that over 70% of the Earth is filled with water. The problem is that only 2.5% of it is freshwater. Of this, only 1% is accessible to us to process as drinking water. This is because most of the freshwater is in the form of glaciers, icecaps and snowfields. So, there, really, isn’t as much usable water as it seems. The ever-increasing population, has only sent total water requirement northwards. The situation in most parts of the world has become desperate. Water co...