Fatbergs: Negative externalities

Thanks to tutor2u
https://www.tutor2u.net/economics/blog/how-do-you-clear-out-a-fatberg?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Mon%2016th%20October%202017&utm_content=Economics%20daily%20digest%20Mon%2016th%20October%202017+CID_40ce19c7efed0daffca7e79e6e751545&utm_source=CampMonitor&utm_term=How%20do%20you%20clear%20out%20a%20fatberg%20One%20to%20save%20for%20teaching%20negative%20externalities%20The%20marginal%20private%20cost%20of%20disposing%20of%20fat%20tampons%20wipes%20and%20condoms%20is%20close%20to%20zero%20but%20the%20challenge%20of%20clearing%20up%20the