The Madrid 360 Environmental Sustainability Strategy, presented in September 2019, already pointed out in its introduction that “the compelling need to curb climate change led the European Union to establish clearer and more ambitious limits on gas emissions in cities”. In 2020, the European Council endorsed the new binding target for the EU to reduce net greenhouse gas emissions in the EU by at least 55% by 2030 – compared to 1990 levels (European Green Pact) – and, consequently, the Madrid 360 Strategy developed this Roadmap, which not only responded to this call, but also established a higher level of ambition, as befits those cities that want to be at the forefront of the fight against Climate Change.