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A lot of relief supplies filled with love are delivered to disaster-affected sites with the dust stirred up. Packing materials of the relief supplies are collected as recyclable waste, but wet or heavily soiled packing materials are disposed of as combustible waste. Then, biodegradable plastic seals containing plant seeds are attached to these cardboards to be disposed of. Returning to the soil, these seals are degraded to water and carbon dioxide. Water awakens the seeds. It represents the conversion from negative to positive. The discarded cardboards are reborn as plants to suppress CO2 emission, contributing to control of global warming.