Actually, you have pointed out what I think are two great points to elaborate on, rather than a question, it calls for a research.

• Antropomorphic view of the universe and trees: You are doing just the same implying that trees "would not care" about humans, when trees are a part of nature itself, that includes the universe. Trees do not possess a human conscience, but they do have a sense to evolve and to adapt. To not realize that trees in fact have the ingenuity to do what your toilet cannot at all; to turn shit into nutrients and ergo oxygen, it's to in fact make the same assumption that humans are more important than nature and the planet in its whole form. Human race behaviour must change, if not it's their price to pay for their ignorance.
• o2 molecules and saving/preserving them: It's not only about managing the less oxygen or more carbon we produce, it's more about really understanding and carrying tests and being involved in these natural processes. I am a tree planter; I have more than 10,000 trees on my inventory. Each tree produces 200 pounds of o2 per year. What does this mean and what purpose does it serve? I basically am an o2 manufacturer. I use trees for that, And each ammount of water and oxygen that I use/produce directly affects the entire ecosystem. My weather is an arid one, so if my calculations are correct; I will be adding rains to our eternal drought in less than two years, and completely transform my entire's region ecosystem, making temperature levels to a cooler indicator, which will translate in much more o2/H2o flowing into the overall climate/weather. Human race doesn't only misuse water, but makes it only for themselves.

Don't you think that these are topics what truly represents how we are polluting and putting in real danger every city/town on Earth? Just by being billions throwing trash like it doesn't matter where it goes? And that is exactly what we do with toilets, washing machines, every plumbing system and how we don't recycle each natural force but instead blindly hinder what is actually there for us to learn and to manage in a better way? Nature is alive, and it's more connected to global solutions than we are.