your friendly neighbourhood vampire

Lying to the reader

Lying to themselves

Simply misinformed

Not paying attention

Has weird priorities

Assumed you knew

Hates you personally

Bad at communicating

Easily sidetracked

Will believe anything

Has weird prejudices

Take a moment and ask yourself, a project like this requires a lot of time, money and dedication of resources, why would scientists dedicate that time to something that could just be done by a tree?

The answer is they wouldn't. So that means this claim requires further investigation!

This project is called LIQUID 3, and it's not meant for cities with wide open spaces, it's meant for cities like Belgrade in Serbia. These cities are densely populated and heavily polluted, to the point where pollution actually chokes out current trees and makes creating green spaces difficult.

Liquid 3 was a PhD scientists answer to these problems. The microalgae tank is intended for spaces where you either:

Don't have enough space to plant full trees, or

Don't have enough time to plant trees and wait for them to grow up.

The tank is extremely efficient when you consider the amount of space needed compared to the amount of CO2 turned into oxygen. The tank can operate throughout the winter. And most importantly, it can be quickly set up in areas that desperately need relief from air pollution NOW not in 10 years when trees are done growing. Children currently suffocating on polluted air can't wait for trees to grow, they need to be taken care of now, and Liquid 3 is one of the ways to take care of them. Depending on the species of microalgea used, a number have shown a pretty amazing capacity to pull heavy metals out of the air which is something trees can get choked up by.

The tanks aren't just tanks either! Liquid 3 have solar panels placed on top, they have lighting and mobile phone charging, and they work as public benches. The designers of it want to encourage green spaces where there's room, but where there isn't room or time, Liquid 3 can step in. Realistically, this isn't a replacement for trees. It's replacing boring metal city benches with new, cooler benches that also clean the air (and have at least some heating during the winter).

Not only that, but the microalgea that grows is native to Serbia and all that microalgea has a ton of great uses! It makes for great fertilizer, compost, wastewater treatment, cleaner biofuels and even for helping create new tanks for further air purification. They only require a quick algae divide once a month, and the produced algae can be carted off to where ever it's needed. This makes them effective solutions for areas that can't sustain complex installations.

me: yeah i know, they’re all primary colors, it’s perfect

When you go for an MLS (Master’s of Library Science, which is a thing, and which is usually required for “professional-level” library work [which is also a weird and contentious concept that I won’t go into here]), one of the things you study is the organization of information. This deals with how to determine what a book or other material is “about"—a concept we tongue-in-cheek call “aboutness"—and how to convey that to a potential user of the item and make it easy for them to find. Things like keywords and subject headings, do I put this book about how often wild birds attack aerial drones in with books about birds or with books about technology, if its a fictional novel do I put fantasy in it’s own section or mix it in with all of the other fiction, so on and so on.

OP is organizing books by how they would look for them. OP’s partner is thinking in terms of aboutness. This is a system that works for OP because it’s their personal library: they know basically what books they own and they only own books that are relevant to them, and if they know what the book looks like, that can be a quick way to find it.

In a library that assumes the public (or people who do not own that particular collection of books) are using the collection, that doesn’t work. Books are often re-issued in multiple covers, or re-bound in new covers when they get worn out, and if the user doesn’t know what the book looks like or is expecting a different cover, they’re lost. That’s why non-personal libraries used standardized cataloging systems like the Dewey Decimal System or Library of Congress System to organize a book by what it’s “about”, and then put books about the same or similar topics together, marked with labels and signage so a person unfamiliar with the book or collection can find their way to it.

Basically, OP’s system works for their own personal library, because it’s best suited to how the primary user—OP themselves—looks for books. OP’s librarian partner is coming from a background of thinking in terms of a public-facing collection, where aboutness is the key criteria and communicating it to a user unfamiliar with the collection is the priority.