How to keep cities cool in face of global warming

Dear EarthTalk: Cities seem to be heating up fast more so than less urban areas. What can we do to keep them cool in the face of increasing global warming? — Paul Smith, Providence, R.I.


As global warming intensifies, cities worldwide are experiencing an accelerated rise in temperatures compared to less urban areas. This phenomenon, known as the urban heat island (UHI) effect, results from the concentration of buildings, roads and other infrastructure that absorb and re-emit heat more than natural landscapes. Addressing urban heat is crucial in the context of global warming to improve public health, reduce energy consumption and enhance the livability of urban environments.

One effective strategy is the implementation of green infrastructure. Urban green spaces, like parks and tree-lined streets, provide shade and cool the air through evapotranspiration, whereby heat is reduced as water evaporates from soil surfaces and transpires from plant leaves. Urban green spaces can significantly reduce the surrounding air temperature, offering a natural solution to urban heat.

White roofs can reflect up to 90 percent of sunlight, reducing heat absorbed by buildings.

Reflective and cool roofs are another strategy to mitigate urban heat. White roofs can reflect up to 90 percent of sunlight, significantly reducing the amount of heat absorbed by buildings. Several cities have successfully implemented white roofs, demonstrating their effectiveness in lowering urban temperatures. Cool roofs, made from lighter colored materials, offer another viable solution. These can be constructed from various materials, including reflective coatings, tiles and membranes. Implementing cool roofs helps reduce urban heat and contributes to energy savings by lowering the need for air conditioning.

Urban design and planning also play a key role in managing urban heat. Cool pavements, which include reflective and permeable materials, can greatly reduce heat absorption versus asphalt and concrete. Cities like Los Angeles have started using cool pavements, showing promising results. Other technological innovations offer advanced solutions for urban cooling. Smart shading systems, which adjust automatically based on the sun’s position, and other innovative technologies, can enhance the effectiveness of traditional methods. Urban climate modeling is another valuable tool that helps urban planners make informed decisions in implementing different heat mitigation strategies.

Globally, many cities have successfully implemented measures to combat urban heat. Singapore’s green roof initiative and Melbourne’s urban forest strategy have had significant impacts on local temperatures. Urban planners, policymakers and communities must adopt multi-faceted approaches and policies to create cooler, more resilient urban environments and protect the health and well-being of city dwellers.

EarthTalk® is produced by Roddy Scheer & Doug Moss for the 501(c)3 nonprofit EarthTalk.

The views expressed here are not necessarily those of The Lakeville Journal and The Journal does not support or oppose candidates for public office.

Latest News

Trade Secrets at 25

Carolyn Piccireli, left, and Richard Lambertson, co-chairs of Trade Secrets.

Anne Day

On May 17 and 18, the 25th anniversary of Trade Secrets will unfurl like a perennial in full bloom. Held at Lime Rock Park and at private gardens in the area, the beloved garden and antiques fundraiser is part curated spectacle, part country house weekend, and all entirely for a cause — it is the primary fundraiser for Project SAGE, the Lakeville-based nonprofit that supports survivors of domestic violence across Connecticut, New York, and Massachusetts.

“People may think they’re coming for the bunnies and birdbaths,” said Richard Lambertson, co-chair and board member. “But they’re really helping fund emergency shelter, legal advocacy, and education. We want that to be clearer this year.”

Keep ReadingShow less
Surviving Wall Street: Scott Bok on power, protest, and collapse

At the Colonial Theatre in North Canaan, Peter Canellos, left, sat down to talk with Scott Bok, resident of Salisbury and author of “Surviving Wall Street: A Tale of Triumph, Tradgedy, and Timing,” about his career.

L. Tomaino

On May 10, the Colonial Theatre in North Canaan hosted Scott Bok, author of “Surviving Wall Street: A Tale of Triumph, Tragedy, and Timing.” Bok is a forty-year veteran of Wall Street. He has served on the boards of several nonprofits and is a resident of Salisbury.

Moderator of the event was Peter Canellos, senior editor of “Politico,” a former editor of the editorial page at the “Boston Globe,” and author of biographies of Ted Kennedy and Supreme Court Justice John Harlan.

Keep ReadingShow less
Singer-songwriters ‘break the fourth wall’ at Down County Social Club

Left-to-right, musicians Gail Ann Dorsey, Séamus Maynard and Natalia Zukerman in-the-round at Race Brook Lodge.

Alec Linden

Singer-songwriters Natalia Zukerman, Gail Ann Dorsey, and Séamus Maynard conjured “the conversational nature of reality” at a free-flowing performance for the Race Brook Lodge’s Down County Social Club on the evening of Thursday, May 8. The trio traded tunes for about an hour and a half, allowing the music to develop in dialogue with each other, the audience, and even an exploding amplifier.

Alex Harvey, who curates the speakeasy-style shows of the DCSC, offered the above words while introducing the three musicians. The ethos of the DCSC is to “break down the barrier” between the artists and audience; to make it “hard to hold up a fourth wall even if they wanted to.”

Keep ReadingShow less