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People are effluent
The water was effluent through the river.
The effluent from the sewage plant drained directly into the river.
The same as all effluent including human effluent, it emits grenhouse gases, as does the belching and farting of all these creatures.
The opposite of "influent" is "effluent." Influent refers to water flowing into a system, while effluent refers to water flowing out of a system.