Final answer:
It is important to keep the water on Earth free from pollution to prevent negative impacts on the limited supply of freshwater that people depend on. Water pollution can already impact more than 1 billion people worldwide who do not have adequate freshwater. Steps have been taken to prevent water pollution and conserve water.
Step-by-step explanation:
It is important to keep the water on Earth free from pollution because even though water is constantly recycled through the water cycle, there is a limited supply of freshwater that people depend on and pollution can negatively impact its quality. Over-use and pollution of freshwater already threaten more than 1 billion people worldwide who do not have adequate freshwater. With the growing human population, the water shortage is likely to get worse. Therefore, steps have been taken to prevent water pollution and technologies have been developed to conserve water and prevent pollution.