The short answer
Judge durability, local availability, recycled content, embodied carbon, maintenance needs and end-of-life recovery.
Durability usually outweighs every other factor: a material that lasts fifty years beats a low-carbon one replaced every ten. Beyond that, look at local sourcing, recycled content, emissions and how it is maintained.
Ask suppliers for environmental documentation rather than marketing claims, and compare like for like using embodied-carbon data where available.
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