Why did I not read this book earlier? It is a great book if you read too much news :)
I have known some statistics about our world before (it is not so bad as you might think), but it was still very useful book. I think that the most useful thing for me was that I started looking at other countries differently. There is no such thing as "western", "developed", or "developing" countries. We humans love to split almost everything into two groups: bad and good, developed and developing, etc. But, this leads to unnecessary bias. It was a good instinct 5000 years ago, but not today.
Remember that in news you almost always will find extreme cases; it is not a majority. Remember to look at data, be aware of averages, do not extrapolate everything linearly, do not blame, just find root cause and expect bad news. It will come. Sooner or later.