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Crows and ravens may be the solution to urban trash. They could pick it up and deposit it for rewards.
Also, I suspect they have a much more developed language than we think.
https://www.theguardian.com/science/grrlscientist/2014/oct/18/caw-vs-kraa-meaning-in-the-calls-of-crows-and-ravens
https://www.adn.com/alaska-news/article/study-ravens-communicate-better-most-animal-kingdom/2011/11/30/
Smarter than the clever ape.
They don't knowingly destroy their habitat.
http://www.popsci.com/ravens-smart-plan-ahead
#scitech