To your last paragraph, I don't find anything that is done intentionally to harm the environment as infringing on my liberty. Littering is illegal. I question your logic here.
Lets logically list this out...
1. Harm to animals: None found.
2. Harm to local ecologies. None found.
Just because you find something in a place does not mean it is causing harm.
A fly lands on my arm crawls around and then craps on me walks a few steps, finds something it finds appealing like left over lunch, because I'm a messy eater, pukes all over it and me. Its does not harm me. Now a million flies and I might get a bacterial infection or even some virus. But concentration is key here.
The pieces balloon are not found in any alarming concentration. Nor are any dead animals being found in concentrations of note. Anywhere.