The environmental impact of concrete, its manufacture, and its applications, are complex, driven in part by direct impacts of construction and infrastructure, as well as by CO2 emissions; between 4-8% of total global CO2 emissions come from concrete.[1] Many depend on circumstances. A major component is cement, which has its own environmental and social impacts and contributes largely to those of concrete.
The cement industry is one of the main producers of carbon dioxide, a greenhouse gas.[2] Concrete causes damage to the most fertile layer of the earth, the topsoil.
Concrete is used to create hard surfaces which contribute to surface runoff that may cause soil erosion, water pollution and flooding. Conversely, concrete is one of the most powerful tools for proper flood control, by means of damming, diversion, and deflection of flood waters, mud flows, and the like. Light-colored concrete can reduce the urban heat island effect, due to its higher albedo.[3] However, original vegetation results in even greater benefit. Concrete dust released by building demolition and natural disasters can be a major source of dangerous air pollution. The presence of some substances in concrete, including useful and unwanted additives, can cause health concerns due to toxicity and (usually naturally occurring) radioactivity.[4] Wet concrete is highly alkaline and should always be handled with proper protective equipment. Concrete recycling is increasing in response to improved environmental awareness, legislation, and economic considerations. Conversely, the use of concrete mitigates the use of alternative building materials such as wood, which is a natural form of carbon sequestering.
^"Concrete: the most destructive material on Earth". the Guardian. 25 February 2019. Retrieved 13 July 2022.
^Cite error: The named reference wbcsd was invoked but never defined (see the help page).
^"Cool Pavement Report" (PDF). Environmental Protection Agency. June 2005. Retrieved 6 February 2009.
^CDC (7 December 2015). "Radiation from Building Materials". Centers for Disease Control and Prevention. Retrieved 25 February 2019.
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