What is the author's tone in Why Geography Matters: Three Challenges Facing America by Harm de Blij?

The overall tone of this book is one of concern for the future of the human race as well as the planet Earth. Although some of De Blij's observations and revelations are frightening, scaring the reader does not seem to be his intent. De Blij is genuinely concerned about the future and has enough education, information, and sense to realize there is reason to be concerned. De Blij is simply conveying what he believes to be the facts, but because the subject matter is so critical, the truth, unfortunately, is quite frightening. De Blij includes numerous bits of personal experiences that add to his credibility and makes the book more personable.