80% of river plastic pollution entering the oceans stem from 1000 rivers
theoceancleanup.com
theoceancleanup.com
The extra energy needed for glass production and transportation of heavier glass bottles would have to be factored in somewhere though.
[0] https://en.wikipedia.org/wiki/Canada%E2%80%93Philippines_was...
Like a 10 minute drive (I was not a driver) from the offices of pretty famous western companies one could see improvised disposal sites for trash; sometimes burning and people going through them and seeing what they can find.
There seemed to be way too little organized trash pickup so people just threw their trash somewhere and after a while either the government acted or people decide to burn it to get rid of it.
I assume if there is a river nearby many will take that option instead of burning it.