A New Wave of National Parks, written by Laura Bush, is a call for the preservation of ocean resources. In the article, the writers uses different methods to build an argument, additionally persuades readers of the concept of protecting the ocean. 
    The author starts the passage with a brief introduction of the Yellowstone National Park, which remains an example throughout the whole article, and its function varies in different part of the article. In the first paragraph, the Yellowstone example leads to the theme of ocean. After explaining the ocean pollution crisis we are facing today, the Yellowstone comes back, being an example of protecting the ocean in paragraph five.  In this paragraph, Laura reveals some details of the Yellowstone National Park including its history, its function and its impact on the topic of protecting the ocean. As written in the passage directly, "Yellowstone offers a blue print for protecting our oceans." , it is clear that the writer intends to offer a historical and possible solution of protecting the ocean, marking the efforts that people had made in history, also inspiring new ideas of the preservation. Thus, the Yellowstone example functions in another aspect in the article.  Finally in the last paragraph, the Yellowstone appears for the last time. Even just existing in only a few words in the fourth sentence( "like we did with Yellowstone") , this time Laura uses the example to remind the readers that it is up to us whether the ocean will be protected or not, and that we must make efforts. 
    Facts and examples can be easily seen in this artcile, which makes the abstract ideas more understandable. Facts come in different ways. It can be personal experience like the one in paragraph three, narrating how the birds got killed by plastics. Or it can be the hard truth as told in the second paragraph, listing numbers and percentages to show the importance the urgence of preserving the ocean. What's more, telling the hard truth by introducing historical examples can be effective too. In the paragraph 6 to 8, the author used a lot of words telling the historical policies in protecting the ocean. By piling up the facts and datas, readers are more likely to be persuaded and the context itself also becomes more convinced.
    Not only the facts and examples are the effective factors that build the argument, but also the proper use of words. Take the last sentence as an example, the arthor gives an ultimate destination that human beings are trying to reach: a natural, undisturbed incubators of life. The three adjectives gives an atmosphere of hope, and thus encourage people to make efforts to preserve the nature, and leave it undisturbed. Such details also exists in the sentence "We are at risk of permanently losing vital marine resources and harming our quality of life." . The word "permanently" and "vital" explains how important the marine resource is to us, and how necessary it is for us to preserve it.
     By listing facts, using appropriate words and put the words in a logical order, Laura Bush adds power to the idea of preserving the ocean, thus making the article persuasive and vivid.