Water scarcity is one of the biggest challenges because safe drinking water is reducing year by year. Nothing can survive without water as well as human beings so it is necessary to protect clean water from decreasing from now on. In this essay, three causes of water scarcity will be identified.
PETROLEUM CONSERVATION: A CHALLENGE AND OPPORTUNITY. The use of available energy, is what has set man at the top of the animal world. First, he used wood to light fires to keep beasts away. As his society became more complex, he found new sources of energy and new uses for it. He used coal extens.