

But their shit comes from plants and they get their carbon from the air.
The unnatural additions to that cycle are fertilizers (more nitrates than normal) and complex organic chemicals (pesticides, antibiotics, …).
The carbon cycle is undisturbed by them.
Played with a friend on a sandy area with some trees, it was great fun and requires no maintenance.
I am not a golfer, we used a mini golf club and golf balls i found near actual golf clubs.