"Why do you say this is stupid? You're so negative." Run of the mill conformist toxic optimist tech bro dildo

Trees don’t create shareholder profits

Trees don’t attract VC funding the way some dumb new invention does.

I guess this could be useful in places trees don’t fit but I think there are other simpler solutions.

"What's wrong with trees" ask people who have never had an allergy or thought about what roots do to all those nice expensive foundations

I guess the "problem" with trees is obvious: it takes decades for them to produce the desired cooling effect in urban areas. You plant a dozen young trees today, you can begin to reap the cooldown 10 years later at best. Also, they need a lot if water, and many of them just don't make it - urban surroundings are just much hotter and more stressful (smog, salt...) then standing with other trees in a forest. I fail to see though how these artificial "trees" provide any kind of benefit at all.

I recently learned that there's a group dedicated to planting 1000 trees in the city of Trenton, NJ, USA. I'm really glad to see a city working to bring back a little nature!

This is missing out on likely the most important part of trees in urban areas. Shade. They give you a cooler place to stand or walk through.

This just makes me think it’s an aquarium that needs to be cleaned.

Upkeep costs. Oh, wait.

Your just thinking outside the box!

A few reasons: Trees need a lot of space and the space underneath a sidewalk isn't enough for long term life. They can die after like 30 years? This is tree dependent and location dependent.

Tree roots can destroy sidewalks making it harder for people to go over them. (Think people in wheel chairs)

Liability in terms of damage (have you seen trees after a storm?)

I guess it would take a lot of time to accommodate Mars for trees. More than for algae ;)