Each year, Midland ACS co-sponsors an Earth Day expo in the month of April with one or more collaborators, such as Midland Center for the Arts (MCFTA) and Midland Volunteers for Recycling. These focus on the National ACS theme (see below) and may also involve speakers and other associated events. National ACS also conducts a K-12 Illustrated Poem Contest; in 2017, Midland ACS participated with top entries displayed at MCFTA and Creative 360, and local prizes as well as a small reception.
- 2017 theme: “Chemistry Helps Feed the World”
- 2018 theme: “Dive Into Marine Chemistry”
- 2019 theme: “Take Note: Paper Chemistry”
- 2020 theme: 50th anniversary of Earth Day, TBD