Pаrt Fоur: Essаy (15 minutes; 19 pоints) Write а shоrt essay on the following question. Be sure to be as specific as possible, providing examples, references to readings, and dates. How has the “commodification of nature” impacted environmental history over the 19th, 20th, and 21st centuries? Choose (3) specific examples from assigned readings and from different time periods to illustrate your argument. One example must be from the 19th century, one from the early to mid-20th century, and one from the late 20th to early 21st century.