Green cities and towns are essential to cope with climate change, restore biodiversity and promote the health of citizens. That is why we challenge all municipalities in the Netherlands to participate in the Green City Challenge 2021! Everyone wants greener, but the question is how? We believe it starts with insight. Which neighborhood is the greenest? How much green space does each resident have at their disposal? And where exactly is planting lacking? The Green City Challenge investigates this and provides in-depth insight into the greening potential per district on the basis of data analyzes (including satellite, aerial photos and BGT).