citizen" differ in different languages and cultures. For smaller studies, several multi-item scales have been developed, including Sam McFarland and colleagues' Identification with All Humanity scale (e.g., "How much do you identify with (that is, feel a part of, feel love toward, have concern for) ... all humans everywhere?"), Anna Malsch and Alan Omoto's Psychological Sense of Global Community (e.g., "I feel a sense of connection to people all over the world, even if I don't know them personally"), Gerhard Reese and colleagues' Global Social Identity scale (e.g. "I feel strongly connected to the world community as a whole"), and Stephen Reysen and Katzarska-Miller's global citizenship identification scale (e.g., "I strongly identify with global citizens"). These measures are strongly related to one another, but they are not fully identical. Studies of the psychological roots of global citizenship have found that persons high in global citizenship are also high on the personality traits of openness to experience and agreeableness from the Big Five personality traits and high in empathy and caring. Oppositely, the authoritarian personality, the social dominance orientation, and psychopathy are all associated with less global human identification. Some of these traits are influenced by heredity as well as by early experiences, which, in turn, likely influence individuals' receptiveness to global human identification. Research has found that those who are high in global human identification are less prejudiced toward many groups, care more about international human rights, worldwide inequality, global poverty and human suffering. They attend more actively to global concerns, value the lives of all human beings more equally, and give more in time and money to international humanitarian causes. They tend to be more politically liberal on both domestic and international issues. They want their countries to do more to alleviate global suffering. Following a social identity approach, Reysen and Katzarska-Miller tested a model showing the antecedents and outcomes of global citizenship identification (i.e., degree of psychological connection with global citizens). Individuals' normative environment (the cultural environment in which one is embedded contains people, artifacts, cultural patterns that promote viewing the self as a global citizen) and global awareness (perceiving oneself as aware, knowledgeable, and connected to others in the world) predict global citizenship identification. Global citizenship identification then predicts six broad categories of prosocial behaviors and values, including: intergroup empathy, valuing diversity, social justice, environmental sustainability, intergroup helping, and a felt responsibility to act. Subsequent research has