@nony - We’ve come a long way because everyone is more conscientious about these things. I try to be careful about paint, not only the kind of paint I buy but also how I dispose of it.
You should never clean your paint brush by dumping excess paint into the ground. This is a clear environmental hazard and also I think it’s illegal.
I buy only as much paint as I need for a given project, even if that means I have to make multiple trips to the store when I run out.