The increasing concentration of carbon dioxide (CO2) in the atmosphere, as one of the major environmental challenges of this century, has drawn researchers’ attention to converting this greenhouse gas into valuable carbon materials. This study reviews and compares various methods for converting CO2 into carbon allotropes, with an emphasis on their industrial applicability. Six main carbon allotropes – graphene, carbon nanotubes, carbon nanofibers, fullerenes, diamonds, and porous carbons – have been analyzed in terms of yield, production cost, and operating conditions. The results indicate that carbon nanotubes and nanofibers, with yields of 80–100% and production costs of 800–1600 USD per ton, are economically viable and environmentally friendly options. In contrast, producing high-quality multilayer graphene requires high temperatures and expensive catalysts. Fullerenes and diamonds, due to low yields of 0.2–9.6% and the need for extreme conditions, are primarily limited to laboratory-scale applications. Porous carbons also remain challenging due to operational costs and limited catalyst durability. Overall, molten carbonate electrolysis emerges as a promising route for the industrial conversion of CO2, offering high yield, suitable operating conditions, and compatibility with renewable energy sources.