Water

S1, E3: Our Earth is shaped by the forces of nature, including one element that has become the elixir of life for our planet: water. Without it, human civilization cannot exist. But while water covers more than 70% of our planet's surface, the freshwater we need for drinking, cooking, and bathing is growing increasingly rare as human population continues to expand. See what scientists and environmentalists are doing to battle changes to our ecosystems, sedimentation rates, and global warming in order to protect our freshwater's quantity and quality.