Tackling environmental and sustainability issues has grown in popularity in writing courses. Yet, for teachers designing professional and technical writing classes, what are the benefits and drawbacks in asking students to interact with place-based discourses in their digital compositions, including blogs? How does implementing an ecocomposition curriculum and sustainability topics in professional and technical writing courses affect students' research, digital writing, collaborative, and critical-thinking outcomes, along with influencing their personal and larger goals? This article discusses a four-year case study at a Southwestern university of an experimental course assignment's design, and it involves 252 students, including many Native Americans. Students engaged with environmental themes and ecocomposition methods in an upper-division class. This article includes a description of the class's major assignment, a blog site and reflective essay, and the blog's assessment criteria, with raters measuring the blog's writing outcomes. Overall, employing ecocomposition practices within the blog assignment unit provided students with a relevant curriculum, assisting them in conducting research for a blog space; writing digitally and thinking critically about diverse spaces related to their backgrounds, majors, and futures; and forging ties with classmates and potential outside audiences. The study's results have implications for implementing ecocomposition design in writing classes.