Water has always been treated as a given—something that flows, cleans, supports life, and renews itself without question. Modern civilization was built on that assumption.

That assumption is quietly failing.

H₂O is not a book about sudden environmental disasters or loud warnings. It is a calm, thoughtful exploration of how water—once a background support system—has become a defining limit for civilization itself.

Drawing from ecology, everyday observation, and long-term patterns, the book examines how groundwater overuse, polluted rivers, industrial discharge, population pressure, and delayed restraint have reshaped the world’s most essential resource. It shows how water scarcity does not arrive as a single event, but as a gradual tightening of choices—felt first in quality, then in availability, and finally in stability.

Written in clear, accessible language, this book is suitable for general readers as well as students, teachers, and serious learners interested in biology, ecology, environmental studies, and sustainability. It avoids technical overload and activist slogans, focusing instead on understanding how natural systems respond when limits are ignored.

Rather than offering panic or prediction, H₂O asks a deeper question:
If water is already setting limits, can human society relearn restraint before those limits enforce themselves?

This book is an invitation to see water not just as a resource, but as the quiet condition that allows life, systems, and civilization to continue.