As always the enduring miracle why are we not all swimming in shit? When you think of the amount of shit that human beings are constantly excreting

As always, the enduring miracle, why are we not all swimming in shit? When you think of the amount of shit that human beings are constantly excreting, why our cities do not smell constantly of shit. An effective sewerage system the enduring monument of modern human civilisation. On my 4th beer, and it is starting to tell.