I don’t remember the name but I read a book years ago that was set in a future where humans live in dense cities with everything in between returned to wilderness. I always thought it was a really compelling idea if it were possible.
But the sheer amount of "flattening" and deforestation I "saw" (as it is easy to not notice it if you consider agricultural land normal) built up to a really unpalatable and disturbing feeling.
It was the first time I felt like I had some rational belief that the human population really should be reduced. Without some wonderful energy source that can provide a worthwhile substitute for sunlight, food production is necessarily limited to the top 0.2-1.5m of land (right?). From aesthetic to environmental factors, it really seems like an awful thing to reduce so much of the fertile lands to just that.