Feature Article

Better Steel, Lower Impacts

Steel’s reputation for high embodied energy and carbon emissions are well documented, but improvements in processing, product selection, and end use can minimize these impacts.

May 2, 2017

Steel is ubiquitous in commercial buildings, found in everything from rebar in concrete footings to metal roofing. If protected from moisture and corrosion, steel will last 100 years or more, and at the end of its service life, it can be recycled back into structural components with no loss in performance. There are few materials that combine the strength, ductility, durability, and versatility of steel.

This performance comes at a high environmental cost, however. The iron and steel industry is one of the world’s largest industrial energy consumers, and one of the largest emitters of CO2 in the world. Steel production accounts for about 6.6% of the world’s anthropogenic CO2 emissions, according to the World Steel Association. That is more than cement at 5%, which is often demonized for its carbon emissions.