Urban sustainability: Co2 uptake by green areas in the historic centre of Siena

Green areas in Siena's historic center contribute significantly to CO2 absorption, with an efficiency of 1.95 t CO2 per hectare annually—a remarkable figure for a densely populated urban area. This study quantifies the carbon uptake capacity (330.50 t CO2 yr⁻¹) of vegetation types such as trees, olive groves, vineyards, and grasslands, highlighting their role in regulating planetary energy balance. By analyzing 71.54 ha of green spaces within the 169.64-ha historic center, researchers demonstrate that strategic urban planning and maintenance of green areas are critical for sustainable city development. The findings underscore the ecological value of preserving natural heritage even in highly urbanized settings.

Marchi, M., Niccolucci, V., Pulselli, R. M., & Marchettini, N. (2018). Urban sustainability: Co₂ uptake by green areas in the historic centre of Siena. International Journal of Design & Nature and Ecodynamics, 12(4), 407–417. https://doi.org/10.2495/dne-v12-n4-407-417