Big Bang Theory, creation by deities (God, Buddha, etc) and Darwinism I would think.
Answer:
Egypt, as Herodotus wrote, is the Gift of the Nile. ... No Nile, no Egypt. It's that simple. But the Nile isn't Egypt's alone: its flow, and those of its tributaries, also waters the soils, and is fed by the rivers, of Sudan, Ethiopia, and several other African nations.
Explanation
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Global water supply is currently a troubling issue. The world's population size is steadily increasing, without the increase in water supply, leaving many to fear an impending shortage.
Freshwater is not evenly distributed across the globe and desalination of water is one solution put forth, but it also comes with its own challenges such as: being very expensive, requiring large amounts of energy, harsh impact on marine life, water being a commodity controlled by large corporations, and emissions having a harsh effect on environments.