Biomass conversion to biochar is a relatively new and promising strategy for global climate change mitigation, circular economy, and sustainable development. Applying biochar to soils stores carbon for extended periods and improves soil properties. It acts as a soil conditioner, facilitating the storage and delivery of nutrients and water to plants while offering an ideal environment for soil microorganisms to thrive. Olive tree prunings are a significant source of agricultural biomass waste in Greece and other Mediterranean countries, often disposed of through open burning in the field. Alternatively, Pyrogenic Carbon Capture and Storage can be applied, utilizing olive prunings as a feedstock. Open flame pyrolysis kilns provide a relatively fast, easy, inexpensive, and effective method for carbonizing olive prunings and other biomass residues, with high carbon capture efficiency and low emissions. This process yields high-quality biochar. The kilns are portable, and the procedure can be implemented in various locations where biomass is available, without the need for expert supervision. It appears to be a worthwhile alternative for biomass waste management, warranting further study, development, and application. This study aims to present the use of open flame pyrolysis kilns for managing olive tree prunings and producing valuable by-products such as biochar. Additionally, this work conducts an initial assessment of potential environmental impacts arising from this procedure, with a focus on mitigating CO2 emissions, the primary greenhouse gas emitted through human activities.