“…This minor addition to the design increased the average weight of recycled paper by more than one hundred percent. Similar results were obtained by asking people to sign an agreement to replace ordinary lamp bulbs at home by low consumption ones (Joule, Girandola, and Bernard, 2007) or to shower instead of bath (Joule, Bernard, and HalimiFalkowicz, 2008). When commitment is made stronger through writing or public announcement, the change in behavior is longer-lasting, and survives after the promise have been made (Geller, Kalsher, Rudd, and Lehman, 1989;Boyce and Geller, 2000).…”