“…Various statements supporting sustainability are all expressions of values, such as the Millennium Declaration that is an explicit statement founded on a core set of important values that are essential to international relations: freedom, equality, solidarity, tolerance, respect for nature, and shared responsibility. Abstract values, such as peace, freedom, equity, justice, are of great importance to humanity, because they suggest essential principles for societies that guide our current actions and shape our vision for the future (Wu 2013) and explain the motivational bases of attitudes and behavior (Rokeach 1979;Karp 1996;Rohan 2000;Bardi and Schwartz 2003;Leiserowitz et al 2006). The Schwartz's value theory (Schwartz 1992) provides one of the most widely cited value frameworks identifying ten universal values (power, achievement, hedonism, stimulation, self-direction, universalism, benevolence, conformity, tradition, security) according to the motivation that underlies each of them.…”