Detroit and climate change
Detroit, a major urban center in the American Midwest, is experiencing the tangible effects of a changing climate, facing increased temperatures, altered precipitation patterns, and a heightened frequency of extreme weather events.[1] These changes pose significant challenges to the city’s infrastructure, public health, and environment, particularly for its predominantly Black or African American population, which comprises nearly 79% of residents.[2] Understanding the specific climate risks facing Detroit and the ongoing efforts to build resilience are crucial for the city’s future.
History
Detroit’s industrial past has contributed to its current vulnerability to climate change. The city’s development as a manufacturing hub, particularly in the automotive industry, led to significant air pollution from numerous sources.[3] More than 42 major and minor polluting sources surround residents, contributing to health issues ranging from cancer to heart disease, and exacerbating the impacts of climate change.[4] While industrial activity has declined in recent decades, the legacy of pollution continues to affect air and water quality, making the city more susceptible to the health impacts of a warming climate.
Historically, Detroit has also experienced population decline since 1950, though this decline has slowed in recent years.[5] This demographic shift, coupled with economic challenges, has resulted in vacant land and aging infrastructure, further increasing the city’s vulnerability to climate-related hazards. Development between 1990 and 2000 occurred three times faster than population growth in the Southeast Michigan Council of Governments (SEMCOG) region, indicating a pattern of land use that may not be sustainable in the face of climate change.[6]
Geography
Detroit’s geographical location along the Detroit River and within the Great Lakes region significantly influences its climate vulnerabilities. The city has been warming at a rate of approximately 0.4℉ per decade since 1960.[7] Between 1951 and 2014, Detroit experienced a 2.7°F increase in average temperatures and a 10.7% increase in precipitation.[8] These changes are projected to continue, with average temperatures expected to rise in each season.[9]
The city’s proximity to the Great Lakes also contributes to increased humidity and lake-effect snow, which can exacerbate the impacts of extreme weather events. Fluctuating lake levels pose a threat to both human and environmental health.[10] The Detroit River, a major waterway, is particularly vulnerable to flooding, as demonstrated by the events of July 2020 when water overwhelmed barricades.[11] This event highlighted the city’s susceptibility to increased precipitation and the need for improved flood management strategies.
Climate Risks
Climate change is increasing the frequency and intensity of extreme heat events in Detroit. By 2050, residents are projected to experience an average of approximately 35 days per year with temperatures exceeding 91.3ºF.[12] This poses a significant risk to public health, particularly for vulnerable populations such as the elderly, individuals with chronic health conditions, and those without access to air conditioning.
Increased precipitation and more frequent extreme rainfall events are also major concerns. These events can overwhelm the city’s aging stormwater infrastructure, leading to flooding and property damage. The combination of increased temperatures and precipitation can also contribute to the growth of mold and mildew, further impacting public health. Detroit's urban forest, comprising approximately 22,000 acres and 24.3% canopy coverage, is also vulnerable to climate change impacts, requiring adaptation strategies to ensure its continued health and resilience.[13] Species distribution modeling indicates that the evolving climate will alter the suitable habitat available for diverse tree species within the Detroit region.
Adaptation and Mitigation
Addressing climate change in Detroit requires a multifaceted approach that includes both adaptation and mitigation strategies. Adaptation focuses on reducing the city’s vulnerability to the impacts of climate change, while mitigation aims to reduce greenhouse gas emissions. Detroit’s Climate Action Plan outlines strategies for both.[14]
Potential adaptation strategies include investing in green infrastructure, such as rain gardens and permeable pavements, to manage stormwater runoff. Improving the energy efficiency of buildings and expanding access to cooling centers can help residents cope with extreme heat. Protecting and expanding the urban forest can provide shade, reduce the urban heat island effect, and improve air quality. Furthermore, land managers and decision-makers can develop adaptation strategies, engage with communities, create partnerships, expand volunteer bases, and invest in resilient landscapes.[15]
Mitigation efforts may include transitioning to renewable energy sources, improving public transportation, and promoting sustainable land use practices. Addressing the legacy of pollution from industrial sources is also crucial for improving air quality and reducing the city’s overall carbon footprint. Collaborative efforts between the city government, community organizations, and residents are essential for successfully implementing these strategies.