Fun facts: (1) globally each city resident shares city mass that is >5000 times of their body (2) cites analogous to Russian doll? economies of scale exists across nested scales. Sublinearity seems to be the glue that enables ever increasing urban complexity. arxiv.org/abs/2507.03960

[3/3] Studying different forms of urban waste can open new doors toward carbon neutrality. It is fair to argue the study of waste represents a novel frontier in global biogeochemistry research.

[2/3] Landfills contribute to roughly one-tenth of global methane emissions, yet their standing carbon stock remains poorly characterized. In 346 Chinese cities alone, we estimate the landfill standing stock to be 0.5 Gigaton—equivalent to the weight of 50,000 Eiffel Towers.

Congratulations to Shijun for this new publication: Carbon-negative transition by utilizing overlooked carbon in waste landfills. We explored an overlooked aspect of the global carbon cycle: carbon stored in modern city landfills. #NovelFrontiers #GlobalBiogeochemistry #UrbanWaste #IndustrialEcology