Green carbon encompasses biochar, activated carbon, and carbon materials produced from biomass through sustainable processes. Pyrolysis of agricultural waste, forestry residues, and organic materials at 400-700°C in oxygen-limited environments yields biochar with high carbon content and porous structure. This material sequesters carbon for centuries when applied to soil, simultaneously improving water retention, nutrient availability, and crop yields. Activation through steam or chemical treatment creates high-surface-area materials for water filtration, air purification, and industrial processes. Green carbon production diverts waste from landfills, creates rural employment, and generates carbon credits. The process also yields bio-oil and syngas as co-products, maximizing resource utilization.