Green cities as trailblazers for global climate impact
A comprehensive meta-study by the Mercator Research Institute on Global Commons and Climate Change (MCC) analyses the potential and challenges of urban CO2 removal methods. The study shows how cities could make a significant contribution to reducing global CO2 emissions through innovative construction techniques and urban planning.
The MCC study, published in the journal Nature Cities, highlights four key methods of CO2 removal in urban environments that could sequester one gigatonne of CO2 annually by the middle of the century. The methods analysed include adding biochar to cement, increasing the use of wood in construction, enriching urban soils with biochar and installing CO2 filters in commercial buildings. Together, these approaches could make a significant contribution to achieving net-zero urban emissions.
Urban strategies for the climate and more
Quirina Rodriguez Mendez, PhD student at the MCC and lead author of the study, emphasises that these techniques are of great benefit not only in terms of climate protection, but also for environmental quality and well-being in cities. For example, the use of special colour pigments and surface materials to improve the reflectivity of urban surfaces could significantly lower the temperature in cities and reduce the energy required for air conditioning systems.
Local actions with a global impact
The study emphasises the role of cities as “test laboratories” for climate protection, where local measures can be implemented quickly and potentially scaled up globally. Felix Creutzig, head of the MCC working group and co-author of the study, emphasises that local climate solutions, although often underestimated, can have an impressive impact and improve quality of life. The research findings offer important insights and recommendations for policymakers shaping urban infrastructure and policies.