When bulding green can harm the environment ?

A good example of a hidden trade-off is concrete, which seems green once you own it, but is environmentally harmful to produce. Concrete is very durable, all natural and technically recyclable but its chief ingredient is Portland cement, which is heated to 5,000 degrees during manufacturing and lets off high carbon emissions.....

How global supply chains work adds to this problem because very few green operations are completely vertically integrated, meaning that it's rare for a company to own and operate every phase of the manufacturing process. From the time a piece of bamboo is harvested to the time it's installed, it's often gone through the hands of multiple companies some green, some not so much. The shipping and trucking companies used to get the materials might not be green-oriented, and the factory where the bamboo is pressed might bond it with formaldehyde, or use a  toxic finishing product which is harmful.

good point by you guys. We should also give due considerations on how a product uses energy over its life makes a big difference as well. Carpets, for instance, might be made from sustainable fibres or recycled soda bottles. Assuming it's not backed with vinyl, which some are, think about the idea of the carpet itself. It requires cleaning, vacuuming and collects dust and pollen more than hardwood does. You need to amortise every extra watt it will require and sneeze it will cause over its life......