A significant area of land worldwide is contaminated and therefore unfit for any use. There is a huge need for bringing the polluted lands back to usable conditions in a harmless and sustainable way. In the Phy2Climate project, phytoremediation of contaminated sites in 4 regions all over the world is combined with innovative biomass processing technologies to produce clean drop-in biofuels for road and shipping transport as well as bio-coke as substitution of petroleum coke in the metallurgical industry. Greenhouse Gas reduction should be achieved by substituting fossil fuels and pet-coke as well as by enhancing the organic carbon content in the soil. To be able to independently judge the sustainability aspects of the technology, its environmental impact has to be analyzed in terms of the whole life cycle. The process refers to a multi-effect system with variable feedstock scenarios. Apart from the environmental impact analysis, the technology will be also analyzed from a societal point of view. One of the aims of this project is to develop a practical social acceptance toolkit to deal with societal acceptance issues, including possible resistance or lack of understanding of the technology. Sustainability assessment is always an iterative process, sensitive to and relying on collected data. This presentation includes details of the methodology applied for the purposes of Life Cycle Assessment and Social Acceptance studies, presenting their challenges and expected effects.