The reason The Population Bomb was so terrible is not that its predictions were wrong; most scientists make incorrect predictions. No, the book is terrible because of how it made people in the developed world feel about people in the developing world. Namely, that they are little more than hungry cockroaches who shouldn't be fed.
It's been 50 years since Dr. Paul R. Ehrlich published his anti-population growth screed, The Population Bomb. Although he scared some folks and annoyed more, most of the deadly consequences he foresaw just didn't happen.