When I first saw the announcement for the PhD project on Environmental and Social Life Cycle Assessment for the Production of High-grade concrete from Construction and Demolition Waste, I felt as if someone has read my thoughts about what could be my dream PhD research project and announced it. I would like to thank my supervisors Stig Irving Olsen and Michael Zwichky Hauschild for creating the PhD project and giving me the opportunity to implement it. I would like to thank my main supervisor – Stig Olsen - for his kindness, enormous patience, unconditional support, earthiness and practicality, which make him a unique supervisor. I would like to thank my second supervisor - Michael Hauschild - for inspiring me to work in the field of life cycle assessment. I would like to thank the Division of QSA for the wonderful learning, research and social environment it created, for the constant aspiration for even higher scientific achievement of my colleagues, which creates a very motivating environment. I would like also to thank for all the opportunities I had at QSA to challenge and, thus, develop myself. Last, but not least, I would like to thank for the opportunity to contribute to the really exciting field of life cycle assessment. I would like to thank my coauthors, the C2CA project partners and the SLCA group at QSA for the fruitful cooperation. I would like to thank my family for being there for me when I needed it.