Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.
Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.
Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.
Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.
Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.
Update! HEALTHY BUILDING NETWORK IS NOW HABITABLE.

Healthy Building Network is proud to announce that CEO Gina Ciganik was recognized as a 2021 Women in Sustainability Leadership Award winner!

The awards were created to identify, advance, and celebrate women working in sustainability. Awardees include dedicated women making significant positive changes to the planet, demonstrating bravery in the workplace, and mentoring the next group of women leaders.

Gina joins a group of 85 previous recipients including former Secretary of State Hilary Clinton and leaders from Fortune 500 companies to startups, nonprofits to industry associations, and more.

“I am proud to receive this award and represent the nonprofit sector,” Gina said. “I chose a mission-based career to ensure I work to solve the most intractable problems, while serving as an ally to and working together with underrepresented and marginalized communities. I’m fortunate to have the privilege, position, and networks to work toward improving the health of people and the planet, leaving no person or place behind.

The 2021 winners were announced in a virtual ceremony. The full list of awardees is below.

  • Jessica Aldridge, Director of Sustainability and Zero Waste Programs, Athens Services
  • Mona Benisi, Executive Director of Morgan Stanley; Head of Sustainability, Global Real Assets, Morgan Stanley Investment Management
  • Dr. Marilyn Black, Vice President and Senior Technical and Strategic Advisor, Underwriters Laboratories Inc.
  • Sonja Bochart, Regenerative Design, Sustainability and Biophilia Consulting
  • Christine Brunel-Ligneau, Sustainable Agriculture Strategy, Bayer AG CropScience Division
  • Gina Ciganik, Chief Executive Officer, Healthy Building Network
  • Robyn Eason, Long-Range Planning & Sustainability Manager, City of West Hollywood
  • Dr. Jennifer Holmgren, CEO, LanzaTech; Director and Chair, LanzaJet, Inc.
  • Rachel Hodgdon, President & CEO, International WELL Building Institute (IWBI)
  • Elaine Hsieh, Co-Founder, Head of Corporate Partnerships and Marketing, Third Derivative (D3)

Congratulations, Gina!

If we say climate change, what is the first thing that pops into your head? It’s probably not the impact of toxic chemicals on the environment.

Some people can probably name a chemical that contributes to climate change, whether that is carbon dioxide or methane. But what about other chemicals that you are not as familiar with? In the building materials world, these may include fluorinated blowing agents used in some foam insulation. The agents either have high global warming potential (GWP) or use chemicals in their production that have high GWP.1 Another example is the release of the toxic, global warming, and ozone-depleting chemical carbon tetrachloride in the enormous supply chain of vinyl products, otherwise known as poly vinyl chloride (PVC).2 Purveyors of vinyl products, you may unwittingly be contributing to global warming! 

Yes, the way in which certain chemicals contribute to climate change is important, but this interplay is not the only consequence of chemicals on our climate. Climate change is also altering how toxic chemicals impact our health and the health of the environment – as the world warms, reducing our exposure to toxic chemicals becomes ever more important.

Five Reasons Why Climate Change and Toxic Chemicals are Connected

  1. Temperatures affect how chemicals behave – warmer temperatures increase our exposure to toxic chemicals—.3 Higher temperatures can allow certain chemicals to vaporize more easily and enter the air we breathe.4 Warmer temperatures on Earth can also encourage the breakdown of some chemicals into toxic byproducts.5
  2. Impacts of extreme weather events include concentrated releases of chemicals—catastrophic weather-related events such as hurricanes, fires, etc. can result in the release of toxic chemicals into the air when homes burn, or as factories in the Gulf region are damaged or destroyed.6 These events are becoming more and more frequent and will continue to expose people and the planet to highly concentrated chemical doses.
  3. Climate change can exacerbate the health impacts of air pollution—volatile organic compounds released by chemical products contribute to the production of smog, leading to poor air quality which can negatively impact the lungs or exacerbate respiratory diseases such as asthma or Chronic Obstructive Lung Disease.7 Warmer temperatures amplify these impacts.8 As the largest source of air pollutants slowly transitions from transportation sources to chemical products, and as the earth warms, smart product choices will have even more impact on air quality.9
  4. Toxic chemicals may hinder the body’s ability to adapt to climate change—in recent years, studies discovered that many toxic chemicals are endocrine disruptors.10 Animal studies have highlighted that endocrine-disrupting chemicals can alter metabolism and hinder animals’ ability to adapt to changing temperatures.11 While these findings were in animals, similar effects occur in humans as well, particularly in communities without access to heating or air conditioning.
  5. Toxic chemicals increase communities’ vulnerability to climate change effects—toxic chemicals are an environmental justice issue. Ever heard of Cancer Alley? Cancer Alley is a predominantly African American community located in Southern Louisiana right next door to factories pumping out toxic chemicals every day.12 This 100 mile stretch of land is home to 25 percent of the nation’s petrochemical manufacturing and a large portion of its PVC supply chain.13 Aptly named, the cancer rate in this area is higher than the state and national cancer rate.14 Cancer Alley’s location right next to the Gulf Coast also increases its vulnerability to hurricanes and tropical storms. As climate change increases the frequency of extreme weather events, the impacts of toxic chemicals on this community also deepens.

Caring About Toxic Chemicals Can Help Mitigate the Impact of Climate Change—For You!

While most toxic chemicals do not cause climate change, they do affect how climate change might impact you. These impacts compound as more chemicals are produced or utilized.15 In 1970, the U.S. produced 50 million tons of synthetic chemicals.16 In 1995, the number tripled to 150 million tons, and today, that number continues to increase.17

Very few of the tens of thousands of chemicals on the marketplace are fully tested for health hazards, and details on human exposure to these chemicals are limited.18 We are exposed to these chemicals every day, in varying quantities and mixtures. Over a lifetime, the small exposures add up. Predictions of health outcomes from long-term exposure are already fuzzy at best, but add on the component of climate change and the mystery deepens.19 While researchers continue to study climate change and chemicals to answer the questions we have, there are steps that we can take to help mitigate the negative impact of climate change on chemicals.

Habitable’s Small Piece of the Pie — How We’re Keeping Consumers Safe 

We cannot remove all chemicals from our lives and many play important roles, but, we can follow the precautionary principle. If there is a less toxic chemical or product available that meets our requirements, we should use it. At Habitable, our work is guided by the precautionary principle—otherwise known as ‘better to be safe than sorry.’ Our chemical and product guidance provides advice on better products.Empowering industry to choose safer chemicals and products helps reduce the burden of toxic chemicals on all people and the planet – especially our most vulnerable populations.

Why We Can and Must Do Better  

Between climate change and toxic chemicals, it could be easy to push toxic chemicals to the side as a someday problem and choose to tackle climate change first. But the truth is that the impacts of toxic chemicals are real and happening today and will only get worse in a warming world. These two issues are connected and influence each other’s outcomes. Climate change is having a significant impact on our world, but prioritizing reduction of  toxic chemicals can reduce the negative consequences that climate change will have on chemicals, and consequently on us.

SOURCES

  1. Hydrofluorocarbons (HFCs) are being phased out as blowing agents in plastic foam insulation due to regulatory action in the United States. Starting in January of 2020, they are no longer allowed in most spray foam insulation. Extruded polystyrene (XPS) insulation manufacturers have until January of 2021 to phase out HFCs. The commonly used HFC in XPS, HFC-134a has a global warming potential 1,430 times that of carbon dioxide. A common replacement blowing agent for HFCs is a hydrofluoroolefin (HFO). While the HFO itself has a low GWP, it still uses high GWP chemicals in its production and may release these chemicals when it is made. See “Making Affordable Multifamily Housing More Energy Efficient: A Guide to Healthier Upgrade Materials,” Healthy Building Network, September 2018, https://informed.habitablefuture.org/resources/research/11-making-affordable-multifamily-housing-more-energy-efficient-a-guide-to-healthier-upgrade-materials.; “Substitutes in Polystyrene: Extruded Boardstock and Billet.” United States Environmental Protection Agency: Significant New Alternatives Policy (SNAP). Accessed Sept 16, 2019. https://www.epa.gov/snap/substitutes-polystyrene-extruded-boardstock-and-billet.; “Substitutes in Rigid Polyurethane: Spray.” United States Environmental Protection Agency: Significant New Alternatives Policy (SNAP). Accessed Sept 16, 2019. https://www.epa.gov/snap/substitutes-rigid-polyurethane-spray.
  2. Vallette, Jim. “Chlorine and Building Materials: A Global Inventory of Production Technologies, Markets, and Pollution – Phase 1: Africa, The Americas, and Europe.” Healthy Building Network, July 2018. https://habitablefuture.org/resources/chlorine-building-materials-project-phase-1-africa-the-americas-and-europe/.
  3. Pamela D. Noyes et al., “The Toxicology of Climate Change: Environmental Contaminants in a Warming World,” Environment International 35, no. 6 (August 1, 2009): 971–86, https://doi.org/10.1016/j.envint.2009.02.006.
  4. Noyes et al.
  5. Pamela D. Noyes and Sean C. Lema, “Forecasting the Impacts of Chemical Pollution and Climate Change Interactions on the Health of Wildlife,” Current Zoology 61, no. 4 (August 1, 2015): 669–89, https://doi.org/10.1093/czoolo/61.4.669.
  6. Caroline C. Ummenhofer and Gerald A. Meehl, “Extreme Weather and Climate Events with Ecological Relevance: A Review,” Philosophical Transactions of the Royal Society B: Biological Sciences 372, no. 1723 (June 19, 2017): 20160135, https://doi.org/10.1098/rstb.2016.0135.
  7. C. M. Zigler, C. Choirat, and F. Dominici, “Impact of National Ambient Air Quality Standards Nonattainment Designations on Particulate Pollution and Health.,” Epidemiology (Cambridge, Mass.) 29, no. 2 (March 2018): 165–74, https://doi.org/10.1097/EDE.0000000000000777.
  8. “Volatile Organic Compounds (VOCs).” Minnesota Pollution Control Agency. Accessed October 18, 2019. https://www.pca.state.mn.us/air/volatile-organic-compounds-vocs.
  9. Brian C. McDonald et al., “Volatile Chemical Products Emerging as Largest Petrochemical Source of Urban Organic Emissions,” Science 359, no. 6377 (February 16, 2018): 760–64, https://doi.org/10.1126/science.aaq0524.
  10. Research Roundtable on Environmental Health Sciences, Board on Population Health and Public Health Practice, and Institute of Medicine, The Challenge: Chemicals in Today’s Society (National Academies Press (US), 2014), https://www.ncbi.nlm.nih.gov/books/NBK268889/.
  11. Roundtable on Environmental Health Sciences, Practice, and Medicine.
  12. Wesley James, Chunrong Jia, and Satish Kedia, “Uneven Magnitude of Disparities in Cancer Risks from Air Toxics,” International Journal of Environmental Research and Public Health 9, no. 12 (December 2012): 4365–85, https://doi.org/10.3390/ijerph9124365.
  13. James, Jia, and Kedia.; Vallette.
  14. James, Jia, and Kedia.
  15. Roundtable on Environmental Health Sciences, Practice, and Medicine.
  16. Roundtable on Environmental Health Sciences, Practice, and Medicine
  17. Roundtable on Environmental Health Sciences, Practice, and Medicine.
  18. Pamela D. Noyes and Sean C. Lema, “Forecasting the Impacts of Chemical Pollution and Climate Change Interactions on the Health of Wildlife,” Current Zoology 61, no. 4 (August 1, 2015): 669–89, https://doi.org/10.1093/czoolo/61.4.669
  19. Noyes and Lema.

Two important initiatives are gaining momentum in the green building movement. One seeks to reduce the embodied carbon of building products. The other seeks to increase inclusion, diversity and equity in the green building industry.

It is critical that these efforts align their goals lest, once again, the latest definition and marketing of “green” building products overlooks and overrides the interests of the front line communities most impacted by both climate change and toxic pollution.

The Carbon Leadership Forum describes embodied carbon as “the sum impact of all the greenhouse gas emissions attributed to the materials throughout their life cycle (extracting from the ground, manufacturing, construction, maintenance and end of life/disposal).2 In a widely praised book, The New Carbon Architecture3, Bruce King explains clearly why reducing carbon inputs to building materials immediately—present day carbon releases—is more effective at meeting urgent carbon reduction goals than the gains of even a Net Zero building, which are realized over decades. This approach is embraced by the Materials Carbon Action Network, a growing association of manufacturers and others, which states as its aim “prioritization of embodied carbon in building materials.”(emphasis added).4

Climate action priorities are framed differently by groups at the forefront of movements for climate justice and equity in the green building movement. Mary Robinson, past President of Ireland, UN High Commissioner on Human Rights and UN Special Envoy on Climate Change, says climate justice “insists on a shift from a discourse on greenhouse gases and melting ice caps into a civil rights movement with the people and communities most vulnerable to climate impacts at its heart.” 5 The Equitable and Just National Climate Platform6, adopted by a broad cross section of environmental justice groups and national organizations including Center for American Progress, League of Conservation Voters, Natural Resources Defense Council, and Sierra Club, calls for “prioritizing climate solutions and other policies that also reduce pollution in these legacy communities at the scale needed to significantly improve their public health and quality of life.”  The NAACP’s Centering Equity In The Sustainable Building Sector (CESBS)7 initiative advocates “action on shutting down coal plants and other toxic facilities at the local level, as well as building of new toxic facilities, with advocacy to strengthen development, monitoring, and enforcement of regulations at federal, state, and local levels. Also includes a focus on corporate responsibility and accountability.”8

The embodied carbon and climate justice initiatives are aligned when carbon reductions in building products are achieved through industrial process changes that reduce the use of fossil fuels and other petrochemicals. But rarely, if ever, can building products be manufactured with no carbon footprint, i.e. without fossil fuel inputs. These initiatives may not be aligned when manufacturers promote “carbon neutral” or “carbon negative” products that rely on carbon trading or offsets, the practice of supporting carbon reduction elsewhere (by planting trees or investing in renewable energy) to offset fossil fuel and petrochemical inputs at the factory.  According to the Equitable and Just National Climate Platform: “ . . . these policies do not guarantee emissions reduction in EJ communities and can even allow increased emissions in communities that are already disproportionately burdened with pollution and substandard infrastructure.”  They may also allow increased toxic pollution, if a manufacturer chooses to invest in carbon offsets, for example, rather than invest in process changes that reduce toxic chemical use or emissions.  As a result, disproportionate impacts, often correlated with race, can be perpetuated.

Vinyl provides one example of such inequity. Vinyl’s carbon footprint includes carbon tetrachloride, a chemical released during chlorine production that is simultaneously highly toxic, ozone depleting, and a global warming gas 1,400 times more potent than CO2. Offsetting these releases with tree planting or renewable energy purchases does nothing for the toxic fallout, from carbon tetrachloride, fossil fuels and other petrochemicals, on the communities adjacent to those manufacturing facilities. 

Experts agree that the most embodied carbon reductions by far are to be had in addressing steel and concrete in buildings. Beyond that, experts disagree about the strength of the data available to track carbon reductions and compare products in a meaningful, objective way, and warn of diminishing returns relative to the investment needed to track carbon in every product.  These may prove to be worth pursuing, but not at the expense of meaningful improvements to conditions in fenceline communities.

Habitable believes that these approaches can be reconciled and aligned through dialogue that includes the communities most impacted by the petrochemical infrastructure that is driving climate change. Our chemical hazard database, Pharos, and our collaboration with ChemFORWARD provide manufacturers with the ability to reduce their product’s carbon and toxic footprints. 

We can in good faith pursue reductions in embedded carbon and toxic chemical use, climate and environmental justice and to define climate positive building products accordingly. Prioritizing selection of products simply upon claims of carbon neutrality, however, is not yet warranted.

SOURCES

  1. U.S. Green Building Council, “Resources | U.S. Green Building Council,” LEED, accessed November 14, 2019, http://www.usgbc.org/resources/social-equity-built-environment.
  2. Carbon Leadership Forum, “Why Embodied Carbon?,” Carbon Leadership Forum (blog), accessed November 14, 2019, http://carbonleadershipforum.org/about/why-embodied-carbon/.]
  3. Ecological Building Network, “The New Carbon Architecture,” EBNet, accessed November 14, 2019, https://www.ecobuildnetwork.org/projects/new-carbon-architecture.
  4. Interface, “MaterialsCAN,” accessed November 14, 2019, https://www.interface.com/US/en-US/campaign/transparency/materialsCAN-en_US.
  5. Martin, “Climate Justice,” United Nations Sustainable Development (blog), May 31, 2019, https://www.un.org/sustainabledevelopment/blog/2019/05/climate-justice/.
  6. Equitable and Just, “A Just Climate,” accessed November 14, 2019, https://ajustclimate.org.
  7. NAACP, “NAACP | Centering Equity in the Sustainable Building Sector,” NAACP, accessed November 14, 2019, https://www.naacp.org/climate-justice-resources/centering-equity-sustainable-building-sector/.
  8. NAACP, “NAACP | NAACP Environmental and Climate Justice Program,” NAACP, accessed November 14, 2019, https://www.naacp.org/environmental-climate-justice-about/.

Current climate action plans are bold, they are necessary, they feel impossible, and they are coming into the consciousness of all concerned (and unconcerned), decades after the early reports should have been taken seriously.

At this point, there is an urgency because people are now experiencing the effects of a warming planet:storms, fires, rising tides, health impacts from warmer temperatures, and more.

To date, climate plans have focused on strategies related to renewable and clean energy, greater efficiency, emissions reduction, etc., especially as it relates to building operations and transportation. However, that is only one side of the (enormous) coin, and it misses key opportunities on the opposite side. It is akin to making the decision to improve your health by incorporating an exercise plan, but continuing a diet of nutritionally deficient and unhealthy foods. You will only get so far, and your dedication to exercise will be undercut by your fast food burgers and supersized fries. 

The other side of the coin? If building and transportation energy and emissions reduction is “heads,” what could be so immense that it fills the flipside? The “tails” of that coin is the vast quantities of products being produced, its emissions and pollution, and the need for toxic chemical mitigation. The missing piece in effective climate mitigation and improved global health is a toxic-free, recyclable product cycle (low-waste and closed-loop).

The Link Between Emissions, Circular Economy, and Chemicals

Climate plans must include Circular Economy strategies, and a circular economy is possible only if safe chemistries are used as inputs to products.1 The Ellen MacArthur Foundation’s (EMF) September 2019 report: Completing the Picture: How the Circular Economy Tackles Climate Change makes the case that we must address the product cycle as a core part of climate action plans.2 According to the report, “to date, efforts to tackle the [climate] crisis have focused on a transition to renewable energy, complemented by energy efficiency. Though crucial and wholly consistent with a circular economy, these measures can only address 55% of emissions. The remaining 45% comes from producing the cars, clothes, food, and other products we use every day.” 

There is more than just emissions that makes the product cycle a critical component of an effective climate strategy. At Habitable, our research shows that there is a related and similar urgency in addressing severe health crises, impacting marginalized communities the hardest, but also now affecting a larger population of people. Our plans—starting with transparency (requesting manufacturers provide the public with a complete list of product ingredients); full testing of all chemicals for human and environmental health impacts; and innovation to new, “green” (safer) chemicals—are bold, necessary and they also feel impossible. 

The EMF Completing the Picture report makes the case that we must fundamentally change how our products are made. A key recommendation in reducing emissions is to “design out waste and pollution.” To be even more precise, designing the toxics out of our products is key to eliminating waste and creating the safe and circular economy that is the cornerstone of any climate solution, an inextricable element in human and environmental health.

A companion report by Google, in partnership with EMF, The Role of Safe Chemistry and Healthy Materials in Unlocking the Circular Economy, emphasizes that toxic chemical mitigation is a precursor to a circular economy. It suggests that “the short- and long-term impacts of these new chemical substances has lagged behind the drive to create new molecules and materials. We can see the consequences around us, including ‘sick building syndrome,’ flame retardants accumulating in human breast milk and being passed along to newborns, or entire city populations toxified from local environmental exposures and contaminated drinking water.” The authors of the report put out a challenge to the world’s chemists and material scientists to not only develop molecules and materials that achieve a performance or aesthetic outcome, but also to ensure that these substances are safe for people and the environment, can be cycled and used to create future products, and retain economic value throughout its lifecycle. Safer chemistry is the key to unlock a circular economy.

The health impacts related to our petrochemical and hazardous chemical-dependent product economy are real, but are often unseen or unrecognized. Globally declining sperm counts and reproductive disorders are linked to chemicals in our plastics,3 and a growing library of peer-reviewed studies link today’s epidemic health issues—cancer, diabetes, obesity, asthma and autism—to endocrine-disrupting and neurotoxic chemicals.4 These data often take a back seat to the climate crisis in our headlines, but they too are growing worse and in need of bold action.

“Better Living Through Chemistry” vs Better Chemistry for Healthier Living

DuPont (and other chemical companies) did not get it right with the blanket phrase, “Better Living Through Chemistry.”

Has there been some great progress and benefits from innovative products that use new chemistries and materials?—yes, of course. That said, a significant lack of understanding of the toxicological effects on humans and the environment have come at great cost. We are finding that the tradeoffs are severe—though today, like the early science on climate change, most people are unaware of this silent epidemic, and tend to accept the rise in cancer, autism, fertility problems, and developmental issues in children, as only an unfortunate part of life—they or their loved ones just pulled a short straw, bad luck.

In 1970, the U.S. produced 50 million tons of synthetic chemicals.5 In 1995, the number tripled to 150 million tons, and today, that number continues to increase.6 Very few of the tens of thousands of chemicals in  the marketplace are fully tested for health hazards, and details on human exposure to these chemicals is limited.7 We are exposed to these chemicals every day, in varying quantities and combinations. Over a lifetime, the small exposures add up. Science-based predictions of health outcomes from long-term exposure continue to emerge,8 but add on the component of a warming climate and a new layer of concern is revealing itself.9

Both/And Solution

The best climate plans are holistic. They recognize and include strategies from both the clean and renewable energy effort and safe and circular product cycle. The threats and impacts of climate change and toxic chemicals are synergistic, as are the solutions. They must be tethered in order to be effective. In fact, ignoring the chemical/material side of the coin will undermine progress on climate and energy solutions. 

We know better, and we can do better. 

As energy efficiency and renewable energy gains reduce the carbon footprint of the transportation and building operations sectors, addressing product production assumes an even greater importance. Successfully addressing climate change requires a revolutionary change in how we design and manufacture materials, towards a circular, closed-loop economy. But materials cannot flow effectively in a closed-loop if they are contaminated with toxic chemicals. Safe first, and then circular is possible. 

The urgency to mitigate toxics must be on par with the urgency for clean and renewable energy – they are two sides of the same coin. Failing to recognize this, and create holistic, compatible solutions, will undermine our goals to manage climate change and improve global health. 

SOURCES

  1. “What Is a Circular Economy? | Ellen MacArthur Foundation,” accessed November 25, 2019, https://www.ellenmacarthurfoundation.org/circular-economy/concept.
  2. “Circular Economy Reports & Publications From The Ellen MacArthur Foundation,” accessed November 25, 2019, https://www.ellenmacarthurfoundation.org/publications.
  3. Teresa Carr, “Sperm Counts Are on the Decline – Could Plastics Be to Blame?,” The Guardian, May 24, 2019, sec. US news, https://www.theguardian.com/us-news/2019/may/24/toxic-america-sperm-counts-plastics-research.
  4. Naoko OHTANI et al., “Adverse Effects of Maternal Exposure to Bisphenol F on the Anxiety- and Depression-like Behavior of Offspring,” The Journal of Veterinary Medical Science 79, no. 2 (February 2017): 432–39, https://doi.org/10.1292/jvms.16-0502.
  5. Roundtable on Environmental Health Sciences, Practice, and Medicine.
  6. Roundtable on Environmental Health Sciences, Practice, and Medicine.

As noted in Healthy Building Network’s(HBN) Chlorine and Building Materials report, chlorine production is a major source of releases of carbon tetrachloride, a potent global warming and ozone depleting gas as well as a carcinogen.

As the report reminds us, it’s important to consider not only the use-phase impacts of building products, but the entire life cycle, including primary chemical production that’s several steps back from final product manufacture. 

Blowing agents are used in plastic foam insulation to create the foam structure and also contribute to the insulative properties. Over the years, manufacturers have cycled through a range of fluorocarbons as each prior class is phased out due to environmental concerns – from ozone depleting chlorofluorocarbons (CFCs) to less ozone depleting hydrochlorofluorocarbons (HCFCs) to the non-ozone depleting but high global warming potential hydrofluorocarbons (HFCs) currently common in many types of foam insulation. Manufacturers have now begun the latest shift to next generation, low global warming potential hydrofluoroolefins (HFOs). For extruded polystyrene (XPS), this translates to a shift from commonly used HFC-134a with a global warming potential (GWP) of 1,430 to HFO-1234ze with a GWP of six.2

The summary of these chemical transitions only tells part of the story. While HFOs do not directly deplete the ozone layer or significantly contribute to global warming, many HFOs use carbon tetrachloride (CCl4) as a chemical feedstock. This includes HFO-1234ze, the replacement for HFC-134a (which does not use CCl4) in many applications.3

How is it that this ozone depleting substance is still in use? Many uses of carbon tetrachloride were phased out in 1995, under the terms of the Montreal Protocol to protect the ozone layer. But the Montreal Protocol phase-outs exempted the use of CCl4 as a chemical feedstock, under the assumption that emissions would be minor.4 However, carbon tetrachloride “is not decreasing in the atmosphere as rapidly as expected” based on its known lifetime and emissions, according to a 2016 report on the Mystery of Carbon Tetrachloride. The authors of this report concluded that emissions of carbon tetrachloride during its production, and fugitive emissions from its use as a chemical feedstock, have been significantly unreported and underestimated.5

Production of carbon tetrachloride is likely to increase as industry replaces HFC blowing agents (and refrigerants), most of which aren’t produced with carbon tetrachloride, with HFOs that do use CCl4 as a feedstock.[6] With increased production and use of carbon tetrachloride, increased emissions are expected – and that’s bad news for the earth’s recovering ozone layer.

We recommend against the use of plastic foam insulation whenever possible, but if you do use it, some products are available that use other, less impactful, blowing agents, including hydrocarbons and water. For more recommendations about preferable insulation from a health hazard perspective, review our product guidance at informed.habitablefuture.org.

SOURCES

  1. According to US Toxics Release Inventory (TRI) data from 2012 to 2015, half of the 10 leading sources of carbon tetrachloride releases were chemical complexes with chlor-alkali plants. Reporting from other countries is non-existent or incomplete. The European Pollutant Release and Transfer Register (E-PRTR) contains no reported emissions of carbon tetrachloride from chlorine plants in the European Union between 2012 and 2016. Manufacturers are required to report carbon tetrachloride releases in excess of 100 kg per year, however, European scientists tracking carbon tetrachloride emissions say the industry is likely not reporting emissions. A 2016 report estimated that the chlor-alkali industry worldwide was responsible for about 10,000 metric tons of unreported carbon tetrachloride releases, or about 40% of all unreported carbon tetrachloride releases.
  2. “Comments to the U.S. Environmental Protection Agency (EPA) on the Scope of Its Risk Evaluation for the TSCA Work Plan Chemical: CARBON TETRACHLORIDE (CTC) CAS Reg. No. 56-23-5.” Safer Chemicals, Healthy Families; Environmental Health Strategy Center; Healthy Building Network, March 15, 2017.; “Common Product: XPS Insulation (Extruded Polystyrene).” Pharos Project. Accessed February 1, 2017. https://pharos.habitablefuture.org/common-products/2078867.; “Substitutes in Polystyrene: Extruded Boardstock and Billet.” United States Environmental Protection Agency: Significant New Alternatives Policy (SNAP). Accessed July 26, 2018. https://www.epa.gov/snap/substitutes-polystyrene-extruded-boardstock-and-billet.Global Warming Potential (GWP) defined — Certain gasses, commonly referred to as “greenhouse gasses”, have the ability to warm the earth by absorbing heat from the sun and trapping it in the atmosphere. Global warming potential is a relative measure of how much heat a given greenhouse gas will absorb in a given time period. GWP numbers are relative to carbon dioxide, which has a GWP of 1. The larger the GWP number, the more a gas warms the earth. Learn more about interpreting GWP numbers at www.epa.gov/ghgemissions/ understanding-global-warming-potentials.
  3. Liang, Q., P.A. Newman, and S. Reimann. “SPARC Report on the Mystery of Carbon Tetrachloride.” Stratosphere-troposphere Processes and their Role in Climate, July 2016. https://www.wcrp-climate.org/WCRP-publications/2016/SPARC_ Report7_2016.pdf.
  4. Vallette, Jim. “Chlorine and Building Materials: A Global Inventory of Production Technologies, Markets, and Pollution – Phase 1: Africa, The Americas, and Europe.” Healthy Building Network, July 2018. https://habitablefuture.org/resources/chlorine-building-materials-project-phase-1-africa-the-americas-and-europe/.
  5. Liang, Q., P.A. Newman, and S. Reimann. “SPARC Report on the Mystery of Carbon Tetrachloride.” Stratosphere-troposphere Processes and their Role in Climate, July 2016. https://www.wcrp-climate.org/WCRP-publications/2016/SPARC_ Report7_2016.pdf.

Asphalt (also known as asphalt concrete, bitumen, or road tar) is the most common paving material by far, accounting for a 92 percent share of the 2.5 million miles of roads and highways in the United States. Reclaiming and reusing asphalt has many benefits, including waste prevention, reduction of greenhouse gas emissions, and lower lifecycle impacts compared to virgin asphalt material use.

Keys to increasing the recycling of asphalt and its attendant environmental benefits include simplifying the designs of asphalt mixes, reducing toxic additives in production, tracking materials from production through use and recycling, testing incoming materials for contaminants, and avoiding the addition of cutback solvents and other toxic rejuvenating agents.