The percentages of fresh and saline water have also changed over time. Today, there are about 300 million cubic miles (1.3 trillion cubic kilometers)of H2O On earth. Approximately ninety-seven percent of that exists in oceans. Only around three percent of the earth's water in lakes and rivers is not available in every location. Over forty percent of our drinkable water
is located in lakes in the United States and Siberia.