My name is Tristan Martin and I’m a PhD student from France. I’m working at the French National institute for agricultural research on the agronomic valorization of urine in France and the associated environmental impacts of this valorization. My work in France consists mainly in doing agronomical experiments with different urine based fertilizers to compare their agronomical efficiencies (yields, NH3 volatilization, N2O emissions …). I will be there in Uppsala for 3 month to work on the second part of my PhD which aims to evaluate the impacts of the whole valorization chains (treatment, transport …) using life cycle assessment methodology.