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.
Computer aided design has changed the way steel can be used in buildings, such as the structure used for the Beijing National Stadium (Bird’s Nest).
Photo: Peter23. License: CC BY-SA 3.0. 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.
But the U.S. steel industry has been gradually improving its environmental footprint while improving product performance along the way. To better understand these industry changes and limitations, and how architects and engineers can optimize the use of steel to improve its sustainability, one has to know more about how steel is made.
This article is BuildingGreen Premium content
Two ways to read the full article and get CEUs:
Sign up for BuildingGreen Premium to access all our premium content
To read the full article, subscribe now to BuildingGreen Premium
For full access, sign up now for LEEDuser Premium
LEEDuser tip sheets, written by our team of LEED experts, fill gaps in knowledge we’ve observed between the LEED Reference Guide, LEED Online, and LEED Interpretations. We update them regularly so that our members get the most relevant guidance for current issues on their projects.
( does not provide premium access to BuildingGreen)
