1. Brooklyn has compost bins at most residences, and elsewhere (or at least it was a pilot program, i haven't visited in a year)

2. There are just amazing number of places to compost in brooklyn.

The local farm bit is just there to make them feel better about themselves. That is, again, hipster.

A non-hipster would just be doing it, without making it seem like it's amazing and that they are doing it in some beautiful unique snowflake way.