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Covering a vast array of scientific fields and recent discoveries, Kandel traces water in all its chemical states as it cycles through the seas, the atmosphere, land, icecaps and under the earth. He investigates how nuclear reactions in the interiors of stars produce the oxygen needed to form H20. After showing how the atmosphere's motions apportion moisture, the book follows the course of water over the land, into the soil, and through plants back to the atmosphere. From there, water travels along streams and great rivers back to the seas. Kandel also considers climate change and how political and economic decisions that we make today will affect water resources for the next century.