Cities are getting hotter & sprawl deserves much of the blame
Yes, cities are hot as heck this year. No, low-density sprawl isn't the answer (in fact it's a major culprit).
by Darin Givens | August 10, 2026
2026 has been a grueling year for heat in many cities, with urban heat islands getting a lot of focus, and rightly so.Β According to this Reuters report, βwhile some permeable and moist surfaces, like grass or soil, absorb less heat, other construction materials like asphalt or concrete are capable of absorbing as much as 95% of the sunβs energy, which is then radiated back into the surrounding atmosphere.β
The effect has been deadly this year, particularly with the heat dome in Europe.
And whileΒ mitigation of urban heat islands with known solutionsΒ is crucially important, so is addressing the climate crisis that worsens their effect. And that's a level of complexity that needs to be addressed. Any argument that lays blame on cities for their own extreme heat this year is getting the larger climate equation wrong.
Itβs irrefutably true that car-dependent, low-density sprawl amplifies our emissions in multiple ways: through increased vehicle miles traveled, destruction of natural carbon sinks such as forests and wetlands, wasted energy from low-density infrastructure, and more.
The carbon footprint of sprawl is has a huge effect on climate change; and as our climate warms,Β heat domes will become more likely, and they'll make urban heat islands even hotter.
Without following the thread closely, it may be tempting to view denser urban fabric as a scourge because of its heat islands, while viewing sprawl as a balm for the climate by way of the greenery around detached homes.
I understand that it might be confusing. Suburbs can have cooler microclimates (as long as youβre away from the wide roads and parking lots) and urban heat islands exist to some degree even without this yearβs temperatures. But the situation is more complex than it may seem at first glance.
We have to look at the higher per-capita carbon footprint caused by sprawl:Β as the UN panel on climate change has reported, households in low-density, sprawling places emit significantly more greenhouse gas per capita than urban homes due to higher energy use and destruction of natural ecosystems.
Those higher levels of emissions elevate global baseline temperatures. Due to the overall hotter temperatures, urban heat islands in cities are becoming worse. Itβs a dangerous environmental relationship thatβs causing tragic health issues globally, and thatβs hurting the walkable cities we desperately need.
And make no mistake: pedestrian-oriented, denser urbanism is the solution for a more sustainable future for our built environments, not the enemy.
When daily necessities are located within a walkable or bikeable distance β or within an easy bus ride βΒ the use of personal cars ceases to be a requirement for all trips. And higher population density can provide the ridership thatβs necessary to make mass transit more viable and more efficient: the FTA explicitly states that dense, walkable, mixed-use developmentΒ increases ridership for transit.
Additionally, multi-family buildings with shared walls minimize thermal leaks, dramatically reducing a homeβs exposed surface area. A household in a multi-unit building consumesΒ much less energy for heating and cooling than a standalone, detached suburban home.
There are many details that have to be tended to in these urban environments to achieve the best results, no doubt. Cities need trees and parks and great pedestrian/bike infrastructure and more β density needs to be done well. So letβs do it well, while employing targeted strategies for cooling heat islands.
This data about the sustainability benefits of pedestrian-scaled urbanism has literally been available to us for decadesΒ through qualified sources like the EPA, but I fear the information is slipping away from us amid the noise of daily news intake and the various crucial issues that are understandably occupying our attention.
As difficult as it can be to handle all the truths that we need to hold at once for the sake of a better future, itβs important to continue to hold this one. Donβt let go of it.














