Why is the majority of Earth's freshwater not readily available for our use?

The majority of Earth's freshwater is not readily available for human use because approximately 68.7% of it is trapped in ice caps and glaciers, primarily in Antarctica and Greenland. Additionally, a significant portion exists as groundwater, much of which is deep underground and challenging to access. Surface freshwater sources like rivers and lakes represent only a small fraction of the total freshwater, making them limited and often subject to contamination and depletion. This combination of factors makes accessible freshwater a scarce resource.