How does this passage demonstrate the authors use of logos?

answer:

The logos strategy is one of reason and facts, and the speaker is stating true facts to show to his or her audience that he knows what he's talking about. Precise information such as 1973, population of 210 million, 0.8 percent a year, other countries increasing at 3.3 percent every year, these are examples of logos, where the speaker has the facts, and because the audience knows that the information being presented is official, the listen to him.