The goal of our collaborative experiment is to quantify the carbon impact of modern cloud applications and experimentally demonstrate how the software optimizations and elastic nature of workloads can be leveraged to make cloud applications sustainable and zero- carbon. The collaboration leverages two ongoing projects at Chalmers University and the University of Massachusetts (UMass). The US team will compare how the deployment in Sweden/EU versus a UMass deployment can affect the carbon footprint of the running applications.