Conventional disposable caps pose a problem due to their mass production and consumption, leading to a high environmental burden. Caps made from Green Nano can reduce this burden by lowering carbon dioxide emissions during incineration. Green Nano is a Japanese technology that significantly reduces CO₂ emissions during combustion by adding only a small amount to plastic. Plastics with Green Nano added can greatly reduce CO2 emissions during incineration, contributing to the solution of plastic waste problems. By using environmentally friendly materials, we can raise environmental awareness among companies and consumers, and promote efforts towards the realization of a sustainable society.