10, 2017, and debuted at number one on the New York Times bestseller list. The story centers on 16-year-old Aza Holmes, an Indianapolis high school student with obsessive–compulsive disorder and anxiety, and her search for a fugitive billionaire as she begins a relationship with that billionaire's son. Speaking about the novel, Green said, "This is my first attempt to write directly about the kind of mental illness that has affected my life since childhood, so while the story is fictional, it is also quite personal." Like his previous books, Green signed the first 200,000 copies of the book, as part of the initial run of 1.5 million copies. Upon the release of his book, he and his brother Hank went on a book tour. In May 2018, Green was interviewed by then-quarterback for the Indianapolis Colts Andrew Luck after Turtles All the Way Down was named a selection for the Andrew Luck Book Club. They discussed the book and their relationships with anxiety and stress for the event that promoted the PBS series The Great American Read. The Anthropocene Reviewed In January 2018, Green launched The Anthropocene Reviewed, a solo podcast where he reviews different facets of the Anthropocene, the epoch that includes significant human impact on the environment, on a five-star scale. This can include completely artificial products like Diet Dr. Pepper, natural species that have had their fates altered by human influence like the Canada goose, or phenomena that only influence humanity such as Halley's Comet. Episodes typically contained Green reviewing two topics, accompanied by stories on how they have impacted his life. At the end of 2018, Complexly partnered with WNYC Studios to bring all of their podcasts, including The Anthropocene Reviewed, to the distributor. Green adapted the essays into a book, The Anthropocene Reviewed: Essays on a Human-Centered Planet, which was published by Dutton Penguin on May 18, 2021. The book was Green's first nonfiction book and sixth solo publication. The book received positive reviews and debuted at number one on The New York Times Best Seller list. The book featured revised versions of many of the essays from the podcast, as well as new original essays, ordered chronologically through Green's life to give the book the approximate structure of a memoir. Green wrote about living through the COVID-19 pandemic in many of the essays. As he had done with many of his previous books, Green