Rhetoric is a way to use the language to persuade or to inform the audience, depending on what the authors want to do they will use different strategies ti achieve their goals.
1) Logos: or the appeal to reason relies on logic or reason. Logos often depends on the use of inductive or deductive reasoning. (https://owl.english.purdue.edu/owl/resource/588/04/).
2) Ethos: or the ethical appeal is based on the character, credibility, or reliability of the writer. (https://owl.english.purdue.edu/owl/resource/588/04/)
3) Pathos: or emotional appeal, appeals to an audience’s needs, values, and emotional sensibilities. (https://owl.english.purdue.edu/owl/resource/588/04)
4) Exemplification: Provide examples or cases in point. (http://www.nvcc.edu/home/lshulman/rhetoric.htm)
5) Comparison and contrast: Discuss similarities and differences (http://www.nvcc.edu/home/lshulman/rhetoric.htm)
In this article from the NOAA, The Ocean Adapt, the author talks about the fishes that are affected by Climate Change and how that is also affecting fishers. The fishes populations are moving North searching those properties in the water that are good for them. In the article the author talks about how the fishers are the first in notice this change in the fishes distribution due to the Climate Change. The author is using Ethos supporting his article with different sources. The author goal is to inform about what is happening in the oceans due to the Climate Change he is achieving his goal using Ethos and a professional tone to talk to at the audience.