Reason #1: Water is Finite
People tend to think we won't run out of water due to the fact that there is a seemingly endless supply in the oceans. However, ocean water is not safe to drink. 97% of Earth's water is saltwater, leaving only 3% freshwater. 2.5% of the remaining freshwater is inaccessible, as it is stuck in glaciers and ice caps, leaving only a mere 0.5% of Earth's water usable.