Have you ever thought of arranging a local litter picking event as a church? A quick search on google and you can find schemes run by 'Keep Britain Tidy' and 'Love where you live' which will welcome the connection to a local church. Or you could just buy some high viz jackets and get out on the streets- showing your neighbours that you care about their space and want to actively help. Here's a quote I found from a church that does a monthly pick:
This is one of the ways in which the church can demonstrate it has a positive role to play in the community.