The document discusses why water conservation is important even though the total amount of water on Earth remains constant. It notes that only 1% of Earth's water is freshwater for human use, with most water being saltwater in the oceans or locked up as ice. The water cycle continuously circulates and redistributes water between oceans, atmosphere, and land. However, human activities like leaving taps running can waste freshwater, and the ground absorbs less water when saturated. Therefore, conservation efforts are needed to ensure a sustainable water supply for life despite the water cycle and finite freshwater resources available.