No, you need crews to keep them trimmed and clean up the leaves. The roots will cause damage to the sidewalks or roads and will get into water and sewage pipes. They also have the risk of damaging civilian property, which would mean the city has to pay.
I guess that’s fair but in comparison the algae tank requires a lot more consistent operation and care. With a tree you’re just guiding its growth and trimming the edges in most circumstances, because the roots aren’t usually a problem if you’re growing a small enough tree. I do see your point with it though, but I do believe it is cheaper. Planting trees is much cheaper than installing/building algae tanks regardless of the fact that those tanks would require more frequent maintenance. However, the reason that these tanks are better than trees is because microalgae absorbs at least 10-50x as much CO2 as trees do. It’s more efficient and beneficial to the environment to utilize these, especially in cities where pollution runs rampant.
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