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\begin{enumerate}  \item What does sustainability mean to people from different countries and regions and what are the factors that formed this meaning?  \item How successful were the existing sustainability promotion programmes in different countries? What is the overall contribution of individual lifestyle changes towards more sustainable behaviour? How could this be measured in terms of energy savings, GHG emissions, environmental footprint, etc.?  \item What are crucial success the motives and drivers behind living a sustainable lifestyle?  \item What are the  factors in sustainability affecting the successful  promotion of sustainable lifestyles? How sustainable are these factors in keeping individuals adhere  to inspire people the changes in practiced lifestyles? What are the main causes  for individuals to dismiss  sustainable lifestyles? behaviour and revert back to their previous lifestyle in the long term?  \end{enumerate}  In adressing these questions, I want to investigate how and why do specific population segments, i.e. low income households or upper income households, respond to sustainable consumption. Furthermore, I want to contribute to a better understanding of the role of culture, traditions and how to they relate to national differences regarding a sustainable way of life. Finally, concerning the success factors for sustainability promotion, I want to analyse what can motivate people to make more sustainable choices and what different types of motivation can be distinguished.