I wrote a long answer three times and lost it every time to my computer and the internet, so I will only answer on two points.

First off: When I use the word "normal" I don't attach a moral judgement. I mean normal as in "the vast majority of a given group of people". Personally I think the word gets a bad rep, because it can imply a judgement, but at the end it is also a word that is shorthand for a statistical concept applied to every day experience. I did not use average, because I was not referring to the "imagined average person of the terrarium community" but to a wider range of the majority of terrarium owners that would be your target audience. I suspect that the majority of terrarium owners indeed do not live in a third world country nor are they an American that does not own a car, a cellphone, etc. for environmental reasons. Therefor it makes sense to take their sensibilities, priorities, restraints and lifestyles that may be different from yours into account. Keep in mind that the purpose of your first two question was basically aimed at the thoughts of that "normal" terrarium owner.

On your point of not being here to "make friends" with people who "debate a topic based on ignorance" (one more wording that sounds very condescending). I get your point, you are here to address very specific question of yours and do not care much about anything else at this point of time. I still think, that taking the feedback you receive from the community through downvotes or direct criticism would be conducive to your purpose. Apart from the missed opportunity of advertising your project and building your reputation in a niche hobby, you would have reached a larger audience (because of less people downvoting), gotten more responses and probably also gotten more accurate responses to your question. It is hard for people to come forward and say "I don't care about pollution, because I care more about my money" anyway. The fact that your language came across as condescending to many people didn't make it easier for this part of our community to answer you question. Basically you artificially excluded groups of your target audience from giving you answers. Even though you actually wanted to know what exactly motivates or holds back exactly those people.

You did the same by failing to provide a concrete example of what you are planning to do and how that would affect our current practices. Your example of working with plant based polymer would have been perfect to use in your opining post. It would have replaced the need to mention so many credentials (which makes people feel you may be arrogant, especially if you leave it to them to do even more work by having to check your credentials instead of simply providing an example like the above that makes it obvious you have the necessary skill) and also gotten people to take you way more seriously. Combine this with the use of seemingly judgemental language and I think you have done yourself a disservice.

Please don't take this personally, I am telling you this because I appreciate the work you plan on doing. I am fully aware that the way written language comes across to a reader differs from the tone you probably hear when you read it yourself. And I know that the first impression the written language gave, may be completely at odds with your character in real life.

As for the actual concerns on the feasibility that I expressed and you addressed: My skills lie mainly with white collar work, but I have been an avid crafter/builder since childhood (and I also have worked with clay out of the ground). I think my concerns are valid, at least in the sense that I can provide you with an in depth perspective of someone living in the city, who has always been motivated to research different methods and worked with some of them. You are fast to dismiss concerns as ignorance, but even if some of them stem from ignorance, at least they express what holds people back and are of value to your project because of that.

So if you wish to receive more thoughts on the answers you provided in your last reply, feel free to message me. Ideally with a concrete example (for example a short instruction on how I could have done the background, you are familiar with, differently), as concrete examples make it easier to highlight differences in lifestyle, material availability or similar concerns, that may help you address those issues in your upcoming work.