The production of concrete is responsible for a ton of pollution in the world and while there's significantly lower environmental impact concrete available, few projects use them because of its higher costs for primarily environmental benefits. The distribution of the lifecycle of the environmental impact matters and if things are pretty bad now I'd strongly consider anything with backloaded environmental costs over ones that have environmental costs incurred up-front.
Also, concrete degrades by itself. In decades it crumbles, pulverizes and goes back into being soil.
But, importantly, it does not become toxic particulate like plastic.
[edit: corrected phrasing, thanks zdragnar]
Same for other sustainable materials like compacted soil, gravel, sand...