There are 1.2 × 10²¹ liters of water on Earth. Why do we need to conserve water?

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All of the given reasons are valid and important for why we need to conserve water. Only a small portion of the total amount of water on Earth is actually usable for human consumption and other uses, and as the population grows, there is increasing demand for this limited resource. Additionally, many water sources are shared between different regions and countries, so conservation is necessary to ensure that everyone has access to clean and safe water. Finally, water has numerous vital uses, such as for agriculture, industry, and hygiene, so it is important to conserve it to ensure that these needs can continue to be met in a sustainable way.

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