I was thinking on toilets. Now i live in a city that is expanding and the current sewerage system is old and cant really cope. So we seeing effects of this in our rivers and beaches. We might think we being clean but we really dirtying someone elses habitat!
I think its better to have some sort of composting toilet system than to use fresh drinking water to flush away waste and it often goes directly out to sea. Our harbours are silting up but thats only cos the mangroves are trying to filter the water. In thr Bible, the isralites did the right thing and buried their waste far from camp, they didnt flush it out to sea. I think sometimes humans can be as unsanitary as dogs that dont cover up their poop.