Philadelphia

Spanning 2,000 acres with more than 50 miles of trails, Wissahickon Valley Park in northwest Philadelphia offers a variety of recreational opportunities, from hiking and biking to bird watching and picnicking. We are a professor of history who co-authored a book on the Wissahickon Valley and an assistant professor of biology. We teach students at Chestnut Hill College, which sits directly across the street from this lush urban park, about the environmental history of the Wissahickon forest and the importance of preserving its biodiversity. We’re also developing a documentary on the Wissahickon funded by the Sisters of Saint Joseph. We want our students – and all Philadelphians – to understand the importance of protecting this urban ecosystem as a way to build climate resilience. Like many of the country’s other great urban parks – from Central Park in New York or Rock Creek Park in Washington to the smaller Phalen Park in St. Paul, Minnesota R...

“When it rains, it pours” once was a metaphor for bad things happening in clusters. Now it’s becoming a statement of fact about rainfall in a changing climate. Across the continental U.S., intense single-day precipitation events are growing more frequent, fueled by warming air that can hold increasing levels of moisture. Most recently, areas north of Houston received 12 to 20 inches (30 to 50 centimeters) of rain in several days in early May 2024, leading to swamped roads and evacuations. Earlier in the year, San Diego received 2.72 inches (7 centimeters) of rain on Jan. 22 that damaged nearly 600 homes and displaced about 1,200 people. Two weeks later, an atmospheric river dumped 5 to 10 inches (12 to 25 centimeters) of rain on Los Angeles, causing widespread mudslides and leaving more than a million people without power. Events like these have sparked interest in so-called sponge cities – a comprehensive approach to urban flood mitigation that uses i...

The Northeast corridor is America’s busiest rail line. Each day, its trains deliver 800,000 passengers to Boston, New York, Philadelphia, Washington and points in between. The Northeast corridor is also a name for the place those trains serve: the coastal plain stretching from Virginia to Massachusetts, where over 17% of the country’s population lives on less than 2% of its land. Northeasterners ride the corridor and live there too. Like “Rust Belt,” “Deep South,” “Silicon Valley” and “Appalachia,” “Corridor” has become shorthand for what many people think of as the Northeast’s defining features: its brisk pace of life, high median incomes and liberal politics. In 1961, Republican Sen. Barry Goldwater of Arizona wished someone had “sawed off the Eastern Seaboard and let it float out to sea.” In 2016, conservative F.H. Buckley disparaged “lawyers, academics, trust-fund babies and high...

The ways an urban neighborhood is built and the characteristics of the people who live there are both related to how hot it gets. That is the result of our study, published by the Journal of Buildings. If you have ever noticed that some parts of a city feel significantly hotter than others, you have experienced a phenomenon known as the urban heat island effect. This effect is most noticeable at night and when comparing rural and suburban surroundings with urban ones. How we did our work Our interdisciplinary group of researchers studied two Philadelphia census tracts and found a clear link between outdoor temperature and specific urban characteristics. We then asked whether these urban characteristics can be related to the social vulnerability of the residents. Social vulnerability is a concept that goes beyond the residents’ income to include housing conditions and characteristics of the people – such as their age, education, disability and race. Our social vulne...

During the height of the COVID-19 pandemic, Detroit residents got a break from water shut-offs. In March 2020, just after the coronavirus made hand-washing a matter of public health, the City of Detroit announced a plan that kept water services on for residents for US$25 a month, with the first payment covered by the state. Although all Detroiters had access to water during the pandemic, they continued to be billed at the higher standard rates. In early 2023, Detroit resumed water shut-offs for bill nonpayment. Approximately 60,000, or 27% of Detroit’s 220,000 residential customers, had past-due bills last summer, according to the Detroit Water and Sewerage Department. The average customer owes $700, but some owe as much as $10,000 due to years of unpaid bills. Although a variety of factors contribute to large past-due balances, water services in Detroit are expensive for many households, and the costs are rising. We are geographers and policy analysts with an intere...