Low-carbon tourism is an emerging issue of tourism industry and academia in recent years. Previous studies have provided us some reasons that tourists participate in low-carbon travel or not, however, these reasons are scattered in literature and not been integrated into the construct of low-carbon travel motivation or low-carbon travel constraint. Meanwhile, previous studies often designed low-carbon package tours through the perspective of operators, few studies have assisted independent tourists on how to save energy and reduce carbon in travel. Therefore, this book is focused into two parts. The purpose of one part is to draw on tourism related literature, to develop and test the Low-Carbon Travel Motivation and Constraint Scales. The purpose of the other part is to draw on tourism related literature, to develop and test the Low-Carbon Travel Behavior Scale.