The Siemens We Can Change the World Challenge is a sustainability challenge in which students form teams, work with a teacher/mentor to identify an environmental issue in their community, research it, develop a plan, collect data, analyze that data, and share the results they've found so far. Teams may be made up of 2-3 students, each of whom is a U.S. resident enrolled in a public, private, parochial, or home school in the U.S, under the supervision of an adult.