I can imagine cutting trees, burning large areas of vegetation to allow for mining, which is even worse. Lands get deformed, parts of limestone mountains start collapsing. Plants never grow again in the area unless aggressive regenaration of the land and planting is done. The soil gets fragile and unstable.

I also wonder how the process of production is done. To process limestone usually produces a lot of co2 (I have no reference, but that's what I remember from reading stuff online). Additionally, as many have noted the plastics used (20% of the final mass of the product) still are plastics made from fossil resources. Is a way for recycling known, especially considering the final product is a mixture of plastics and limestone?

It seems that the producer does not have a real, scientific proof that his production is environmentally good, but does it as a 'novel', and 'fascinating' idea with the only goal of making money. The article itself says that the producer looks forward to making a product that will last, but does not indicate that the producer ever had a goal of protecting the environment.

Finally, the subject is very much worth of discussion in HN, and I personally feel thankful for the one who submitted it.