This Green Hackathon was organized as a preconference activity to ICT4S, an international conference on the use of ICT for sustainability, organized by CESC at KTH. The Green Hackathon started with a keynote from Jorge Zapico who is the co-founder of the Green Hackathon initiative and works as a researcher and part-time vegetable farmer. He introduced the idea of the hackathon and a short background on the sustainability challenges of food production. The starting point of the event was that food production and consumption have become a major driver behind environmental degradation, such as climate change, biodiversity loss and degradation of land and freshwater. Agriculture must be transformed to be sustainable and must deliver sufficient amounts of food for the growing population (both through increased efficiency and dietary changes) and also cut greenhouse gas emissions; counteract biodiversity loss; reduce water use and phase out pollution from agricultural chemicals.