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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.

I'm a huge proponent of public transit, rail in specific, and I'm very glad that the greater Seattle area is finally starting to see some solid light rail infrastructure sprouting up in the form of the 1 and 2 lines, but that in no way stops me from critiquing the decisions made in planning and implementation.

Light Rail, in it's colloquial form here in the US, is basically always a compromise solution. It's cheaper than subways, can make good use of existing right-of-way around freeways, and can function as a kind of low-capacity commuter rail in the suburbs while behaving more like a tram or streetcar in downtown areas. It is crucially, however, not a streetcar, nor is it a commuter rail. Streetcars make frequent stops and are optimized for dense areas with lots of traffic. Commuter rails are larger and stop less frequently, optimized for bringing suburban residents into city centers. Commuter rail should, however, be independent of street traffic so it can travel at higher speeds. For this reason, most of the Link light rail system in seattle is actually not at-grade (street level), but on either elevated or sub-grade track. Downtown, the lightrail actually functions as a low-capacity low-frequency subway system in what used to be the bus tunnel (we don't have time, but yes it was stupid). Everywhere else, it's up on elevated tracks that largely follow the freeway system.

There are three stations, all immediately south of that Mount Baker elevated station, where the Link actually runs at-grade. These stations run through the historic low income immigrant neighborhoods of southeast seattle. Here, the trains are forced to stop at red lights, interact with crossing and left-turning traffic, and even cross through sidewalks and terrifyingly narrow pedestrian islands. They could have built elevated track here, as they did everywhere else, but they didn't. they didn't want to spend the money. I have personally watched light rail cars carrying hundreds of people have to wait two full minutes for cars turning left in front of them, delaying trains so like, 5 people could drive there. Once it reaches the end of this low income immigrant-dominant neighborhood, however, the Link returns to it's above-grade status, with Mount Baker being the first elevated stop. You want to know how this woman, who claims she was misdirected by her GPS, probably ended up here? I would bet anything she tried to make a turn at the intersection just before the stop and got confused. The intersection, for reference, looks like this:

I'm not saying it's an easy mistake to make, but given the number of people who drive through here every day, it's honestly not that surprising that someone, especially someone who is from out of town, or someone who is used to shared streetcar lanes, would eventually make this mistake. When you're dealing with a city of hundreds of thousands of people, it's only a matter of time before a mistake like this happens. but it is only possible for it to happen because of the decisions made in the planning process, and one of those decisions was effectively "we can save money if we make everything worse in that part of town where all the foreign poors live", and so they built the thing at-grade, instead of keeping it elevated like everywhere else.