“when the paper is landfilled, it releases up to 398 ml of methane per dry gram, contributing to three-quarters of the total climate change emissions from the paper life cycle [178]. Others incinerate PPI waste. However, this entails high costs and creates environmental risks due to the compounds released into the atmosphere [204], the large quantities of acid, or the infiltration of organic materials into the soil resulting from anaerobic digestion [205].”
https://www.sciencedirect.com/science/article/pii/S1364032122005950