So weird to see more than one-third downvotes, when all the comments are atheist-supporting.
Maybe many read this comic as anti-atheistic ("what a jerk he is for making his poor mom unhappy!")?
In Vienna, we actually import Australian species because of their strong resistance to heat. The very commonly used native buckeye trees have been eaten away at by pests for decades now, and I'm surprised they do not actually seem to die off, but they just stand there with brown leaves for most of the year.
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.
*works in America where walls are actually hollow