“…However, existing online calculators, which apply no environmental behavioural theory, provide a mere calculation function, thereby having limited influence on their users. Environmental behavioural theories argue that the determinants of an individual's environmental behaviour include his/her knowledge, awareness, attitude, behavioural control and social norms (Gatersleben, Steg, and Vlek 2002;Ho, Liao, and Rosenthal 2014;Lim et al 2013;Wan, Shen, and Yu 2014). Therefore, this study attempted to construct a new system grounded on the theories.…”