American universities are in the forefront of research and scholarship—so it makes sense that these institutions would lead in making their facilities environmentally sustainable. In the last 15 years, hundreds of the country’s higher-education institutions have committed to making their campuses carbon neutral. Yet only a tiny few—a dozen or so (or none, depending how the term is defined)—have so far achieved this goal. Erik Olsen, a managing partner in the New York office of the energy consultant Transsolar, has worked with a number of institutions aiming to decarbonize. “The best have detailed plans that they’re far down the road of implementing,” he says. “And the worst have no plan. And some only have plans to make a plan.”
Campuses that do have a realistic plan often tackle the challenge as a small city might, says Lara Pfadt, a senior associate with Boston-based Finegold Alexander Architects. Like cities, many higher-education institutions operate their own heating, power, and transportation infrastructure. “They are asking, ‘How do we green our power generation? How do we reduce our requirements?’” says Pfadt. “They set goals within that, and then they all look at them slightly differently, according to their circumstances.”
The dozen or so American campuses that have announced carbon neutrality account for their operational emissions only (not embodied emissions). Operational emissions are categorized into three “scopes.” Scope 1 encompasses an organization’s direct greenhouse-gas (GHG) emissions—for example, from burning fuel in boilers, furnaces, and vehicles. Scope 2 refers to indirect emissions from the organization’s purchase of energy: emissions that occur at the generating facility are attributed to the energy’s user. Scope 3 covers emissions that the organization causes indirectly, through business travel and employee commuting, for example. All of the carbon-neutral campuses account for Scope 1 and 2 emissions, and they vary as to whether they also include some Scope 3 emissions.
“Where architects can have the most impact is square in that Scope 1 bucket,” says Rebecca Berry, principal and director of sustainability at Finegold Alexander. Several of the universities in Finegold Alexander’s portfolio report about 70 percent of their emissions from Scope 1, she says.
No institution has so far achieved carbon neutrality without relying on carbon offsets—a reduction in GHG emissions that is used to compensate for emissions that occur somewhere else. A carbon-offset credit, certified by governments or independent certification bodies, represents an emissions reduction of one metric ton of CO2 or an equivalent amount of other greenhouse gases.
Offsetting is sometimes criticized as buying a way out of the problem. On the other hand, when the near-term cost of eliminating another ton of carbon becomes cost-prohibitive or logistically impossible, investing in a project that removes GHG on an institution’s behalf can be the right thing to do, both for its mission and for the climate. Purchasing carbon offsets also puts a cost on emissions, and that can help tip the scales in favor of low-carbon choices.
Two universities make excellent case studies in demonstrating how architects can support institutional clients in achieving carbon neutrality. One is the new campus of the University of California, Merced, and the other, the historic campus of Colgate University in Hamilton, New York.
In 2020, the University of California, Merced (UC Merced), became America’s first public research university to reach carbon neutrality, defined in this case as achieving zero net greenhouse-gas emissions for Scope 1 and Scope 2 emission sources. Founded in 2005, and located in California’s San Joaquin Valley, UC Merced was originally built according to a SOM master plan, and then nearly doubled its footprint in 2020, following an updated master plan (also by SOM). With the university’s mission of improving college-matriculation rates in the Valley, three-quarters of its students are their families’ first generation to attend college, nearly two-thirds come from low-income families, and only 10 percent identify as white, making UC Merced a force for social justice as well as environmental responsibility.
The buildings of UC Merced (1), constructed according to a master plan by SOM, use simple materials, including corrugated metal and concrete (top), and have features such as deep overhangs to keep out the strong California Central Valley sun (2). Photos courtesy SOM © Dave Burk, click to enlarge.
The campus demonstrates that high-performance, energy-efficient development on a shoestring budget is possible, says Michael Duncan, a design partner in SOM’s San Francisco office. The two SOM buildings constructed in 2005—a central power plant designed with Arup as a “living laboratory” and the Kolligian Library, in collaboration with Fernau and Hartman—cost between $209 and $285 per square foot. “Even in those days, that was pretty darn tight,” says Duncan. The now 815-acre, 9,000-student campus consists entirely of LEED-certified buildings, with all 11 structures of the recent expansion—including science buildings, residences, and a dining pavilion—achieving platinum-level certification.
Inspired by the region’s vernacular agricultural buildings, the campus architecture uses expressive tectonics, a stripped-down aesthetic, and simple materials, such as concrete and corrugated metal. Deep overhangs, screens, arcades, garage doors, and courtyards link indoor and outdoor spaces while controlling light, heat, and wind. Taller buildings are positioned to shade the streets.
With a compact footprint and building heights up to six stories, the development is more dense than is typical for the Valley, enabling the central power plant to provide efficient heating and cooling to the entire campus. The plant incorporates a superinsulated thermal-energy storage tank, reminiscent of a grain silo, which cools water at night, using off-peak energy, and then redistributes it to campus buildings during the day.
While the university continues working to reduce its remaining Scope 1 emissions—notably the use of natural gas in the central plant and in science labs—the purchase of offsets brings them to net zero. Complementing UC Merced’s energy-efficient buildings, an 8.5-acre photovoltaic field and a 5-megawatt carport solar system, with 500-kilowatt battery storage, generate about 30 percent of the school’s annual required electricity; for the remainder, the campus purchases clean electricity through the University of California’s wholesale power program, thereby bringing its Scope 2 emissions to zero as well. Beyond the technical achievement, the campus’s carbon-neutral status and ongoing efforts to improve it are integrated into UC Merced’s academic, engagement, and operational programs. “It’s not just the infrastructure,” says Duncan. “It’s the whole culture.”
As a new university, UC Merced has the unique advantage of having been designed for energy efficiency from the get-go, but for existing institutions of higher learning, inefficient legacy infrastructure presents a major challenge to achieving carbon neutrality. At Colgate University, a 3,000-student campus founded in 1819, most of the hundred or so buildings making up the school’s 2.4 million square feet are decades, if not centuries, old.
Residents in a pair of RAMSA dormitories that flank a quadrangle (3) at Colgate are competing to see which building can operate most efficiently. A career-services center on campus (4), also by RAMSA, with an R-40 envelope, is designed to use to use 59 percent less energy than baseline (5). Photos © Peter Aaron
Image courtesy Atelier Ten, click to enlarge.
Colgate is one of the fewer than a dozen schools that have achieved carbon neutrality under the Presidents’ Climate Leadership Commitments (PCLC), launched in 2006 as the American College and University Presidents’ Climate Commitment. Signatories to the commitment pledge their institutions to achieve carbon neutrality “as soon as possible” through individually defined combinations of decarbonization and offsets. Administered by the nonprofit Second Nature, the PCLC encompasses Scope 1 and 2 emissions as well as Scope 3 emissions related to university-sponsored travel and employee commuting.
When Colgate made its carbon-neutrality commitment in 2009, the campus was generating baseline emissions of 17,000 metric tons of CO2 equivalents per year, including 8,385 metric tons in Scope 1. Since then, the university has reduced its overall emissions by about 50 percent, offsetting the remainder with third-party-verified credits to become carbon neutral in 2019. “We gave ourselves a 10-year grace period to reduce campus carbon emissions as much as possible before we took financial accountability for our remaining emissions,” says John Pumilio, Colgate’s director of sustainability. “The journey continues.”
To continue reducing building-related emissions, Colgate takes advantage of renovations and maintenance cycles to upgrade building envelope and HVAC systems bit by bit, setting targets for energy-use intensity, or EUI (energy use expressed as a function of a building’s size), commissioning, and monitoring. And it requires new construction to meet more stringent standards.
Colgate’s Benton Center for Creativity and Innovation—the anchor building of a 36,800-square-foot arts complex designed by New York–based Robert A.M. Stern Architects (RAMSA) and now starting construction—will use a ground-source heat pump system to help the campus move away from fossil fuels. (Currently, a natural gas boiler supplements a biomass system, which uses byproducts from local, FSC-certified forests.) An earlier RAMSA project on campus, Benton Hall (2018), an 18,500-square-foot LEED Platinum–certified career-services building, uses 17 percent of the electricity and 41 percent of the total energy of a benchmark building.
To harmonize with the historic campus, both projects are designed using period forms and proportions, roofed with slate, and clad with limestone-trimmed locally quarried bluestone. To achieve contemporary performance standards and a minimum 100-year life cycle from these timeless materials, the enclosures were designed in collaboration with a building-envelope consultant right from the schematic phase, with particular attention paid to minimizing thermal bridging where masonry supports tie through the exterior insulation to the steel structure. The additional depth of the highly insulated (R-40) wall facilitated the traditional detailing of the facades, says RAMSA partner Preston Gumberich, with deep setbacks for the triple-glazed windows’ creating shadow lines like those of the building’s load-bearing masonry neighbors. “There’s a misconception that sustainability is a style,” says Gumberich, “but traditionalist and contextual design is not mutually exclusive with sustainable principles and practices.”
Two new Colgate residences, also by RAMSA, include building-system monitors at main entrances, so that students can see their energy usage in real time and understand their impact on the environment in which they live. A competition has sprung up between the two residences to see which hall can achieve the greatest efficiency over time. “Especially with new buildings and universities, it’s really important that this be educational for the students,” says Gumberich. “It’s a huge opportunity, and we’ve taken advantage of that to the best of our ability.”
Since embarking on its carbon-neutral challenge 13 years ago, Colgate’s annual Scope 1 emissions have ranged between a low of 5,910 metric tons (a 30 percent decrease) and a high of 10,760 metric tons (a 22 percent increase). Emission reductions vary with such factors as the weather (cold years versus warmer years), fuel supply, heating-plant maintenance and renovations, and operational changes such as increased air exchanges during the Covid pandemic. New-building construction and student enrollment have also played a role. Since its 2009 baseline, the university has constructed over 300,000 square feet in five new buildings, and has added about 200 students and more than 110 faculty and staff. “While we’ve seen ups and downs over the years, Colgate has reduced its gross Scope 1 emissions per square foot and per student,” says Pumilio. Even after achieving carbon neutrality, the effort to cut remaining emissions—and the need to offset them—goes on: “Carbon neutrality was never an end goal, and I don’t think it should be,” he says. “But it’s a major milestone.”
In addition to the handful of colleges and universities that have achieved carbon neutrality, there are many more still working toward it. From Finegold Alexander’s work supporting institutional clients through its new FA Energy division, decarbonization entails working in close partnership with a project’s mechanical engineer, and with the architect or the engineer taking the lead, says Berry.
At Wellesley College, for instance, Finegold Alexander has designed envelope upgrades that are now under way at Severance Hall, a 56,000-square-foot student residence built in 1927. A combination of insulated interior partitions is being constructed against the previously uninsulated load-bearing masonry walls, together with interior storm windows for the original steel windows. The upgrade will make it possible to replace the building’s high-temperature steam-heating system with a low-temperature water loop, significantly improving occupant comfort and contributing to Wellesley’s goal of carbon neutrality by 2040.
At Wellesley College, Finegold Alexander’s upgrades to the envelope of a 1927 building will allow it to depend on a less carbon-intensive heating system. Photo © Raj Das
Image courtesy Finegold Alexander, click to enlarge.
As at Wellesley, transitioning from high-temperature fossil-fuel systems is a central challenge for all campuses that have committed to decarbonizing (except for the urban, grid-connected ones that don’t operate their own energy systems). But, says Transsolar’s Olsen, it’s a technical problem that’s not the most important thing for architects. What is important for architects to know, he says, is that, as campuses increasingly roll out requirements for all buildings to meet EUIs compatible with low-temperature heating systems, architects face a design choice. Solutions such as increased insulation, better windows, dedicated outdoor air supply, hydronics, and a few other basics will achieve those targets. “But do they necessarily impact design with a capital D? No,” he says. “Should they? Yes.” Whether it’s expressive, climate-responsive structures at UC Merced or durable, traditionalist buildings at Colgate, with their energy use on display, architecture has the opportunity to showcase campuses’ carbon-neutral ambitions, and, in so doing, influence occupants’ behavior and awareness. Architecture has the power to turn a technical challenge into a cultural change. “Do you see many schools emphasizing that as part of their plan?” says Olsen. “No.” And that, as much as energy performance itself, is something architects can help accomplish.
To earn one AIA learning unit (LU), including one hour of health, safety, and welfare (HSW) credit, read the article above and “Carbon neutrality should not be the end goal: Lessons for institutional climate action from U.S. higher education.” - Alexander R. Barron, Maya Domeschek, Lucy E. Metz, Laura C. Draucker, Aaron L. Strong - One Earth, Volume 4, Issue 9, September 2021, pages 1248-1258.
Then complete the quiz. Upon passing the test, you will receive a certificate of completion, and your credit will be automatically reported to the AIA. Additional information regarding credit-reporting and continuing-education requirements can be found at continuingeducation.bnpmedia.com.
- Discuss the varying definitions of carbon neutrality.
- Outline what scopes 1, 2, and 3 emissions include.
- Explain what carbon offsets are and their role in achieving carbon neutrality.
- Discuss the challenges involved in achieving carbon neutrality on new and historic university campuses.
AIA/CES Course #K2211A