Link: https://phys.org/news/2026-04-sewers-climate-problem-plain-sight.html

According to the Climate and Clean Air Coalition, anthropogenic methane emissions account for nearly 45% of current net warming, making it an important factor in global warming

It is generally assumed that the limited residence time of wastewater in sewer networks is not conducive to methane formation, and that the overall emissions are difficult to monitor and quantify. Therefore, in current greenhouse gas inventories by the IPCC and various countries, urban sewers are considered a negligible source of methane emissions, assumed to be zero.

The team estimates that sewers worldwide emit 1.18 to 1.95 million tons of methane annually. This reveals that global wastewater management has a far more significant impact on greenhouse gas emissions and global warming and is crucial for improving greenhouse gas emissions accounting and promoting global emissions reduction.

Composting toilet + food forest revolution?

Just stop pooping, y'all

This would be more interesting if it talked about why sewers act like this. If implementations are better and if something can be done to improve them. I know with high rises its been talked about to have a centralized biodigester system to heat or power the building.