The paper will briefly introduce the Sustainable Development concept and its implications for the domains of natural-ecological and social-behavioural sciences. Reference will be made to the various dimensions of SD: environmental (i.e.: physical-ecological), economic and social (and thus “social-psychological”) sustainability. Two different trends within ecological sciences will be briefly illustrated, and their respective implication for the promotion of SD will be presented:- the partial ecology paradigm, which has its prevalent focus on natural and physical-biological processes of the ecosystems, and tends to consider the human dimension mainly as a disruptive factor for natural resources;- the full ecology paradigm, which has its focus on both natural and human processes as mutually interdependent parts of any ecosystem. It considers the human dimension, in the perceptual-behavioural sense, as an intrinsic component of any ecosystem, therefore as both potential source of, or threat to, natural resources and biodiversity. As a consequence, the full ecology paradigm also claims for a systematic collaboration between natural and social/human sciences dealing with environmental global changes, and for the development of various new social environmental sciences: ecological economics, environmental sociology, environmental anthropology and also environmental psychology (where the specific individual and social psychological level is considered). At the same time, the peculiarity of environmental psychology is also stressed. The necessity of moving from a site-specific (i.e.: “physically-ecologically based”) to the place-specific (i.e.: “social-psychologically based) approach in the study of people-environment interactions is pointed out. The importance of studying human cognition, affect and behaviour in relation to the daily-life built and natural environment and resources - at the individual, interpersonal and group levels - is outlined. Such an approach seems particularly useful for a “localized” focus to real-life contexts and situations when addressing crucial empirical issues in the domain of global changes and sustainable development (e.g. environmental conflicts and human-environment interdependences, resource dilemmas, etc.). The main theoretical perspectives and some related empirical problems characterising this direction of psychological inquiry will be briefly presented and discussed, and the possible applied outcomes will be envisaged.