In early engineering storm water was a problem that you want to drain as quickly as possible - so the solution was to pave everything including the creeks. Through many urban floods it has been recognized that infiltration into soil is the best solution for pollutants, flooding, and groundwater recharge. But we still have millions of acres of hardscape that needs to be re-designed to soak into the ground and only overflow if necessary.

But that said a lot of cocaine could enter natural waters directly by being illegally trafficked in boats, drones, or planes that crash. The real problem here is the war on drugs - cocaine was once available at every corner drug store. No illegal trafficking, no pollution.

Probably 2 or 3 at most

I host video streaming for personal use and gigabit doesn’t even flinch.

The only use for such speeds in the home is offloading all your data and computing to cloud services. Yay? Symmetrical gigabit is already about 5 times faster than I would ever need. Most people are too lazy to even run a LAN cable to get better than 150-300 mbps.