The author takes a look at how our climate appears to be changing with particular focus on changes in water surpluses and shortages. His premise is not that the earth is facing a water shortage, but rather a water distribution crisis. His suggestion is that we fully recover the costs of our natural resources within the pricing structure of goods and services believing that the market is the best means for modifying behavior. He also looks at novel approaches being taken to fix the problem such as storing water in existing aquifers instead of reservoirs, separating potable water from other needs and designing plumbing accordingly, etc.
The book is interesting and has a good balance of statistics and anecdotes. The author is Canadian so there's a definite Canadian perspective to the book--it's not a bad thing, necessarily, just different.
While there is some information about what individuals can do, this is primarily a big picture book and details efforts that the author believes need to be taken at the governmental level--be that a water district, municipality, state, province, or country.