This week on Truth To Power, we're listening back to a community conversation about the Urban Heat Island effect here in Louisville and the role trees can play in keeping our urban core cool. Back on June 10, 2026, UofL's Envirome Institute organized this event at Spalding University to welcome back to town Georgia Tech’s Dr. Brian Stone who has been studying the Urban Heat Island effect in Louisville and other U.S. cities for over a decade. Today you'll get caught up on the latest data about Louisville’s urban heat risk and the use of trees as urban infrastructure.
A full recording of the presentation is available at https://www.youtube.com/watch?v=toEh4kQ-f1c
As part of the Greenprint initiative, the University of Louisville Christina Lee Brown Envirome Institute invited Dr. Brian Stone of the Georgia Institute of Technology’s Urban Climate Lab to Louisville to present the results of a new Jefferson County urban heat and tree canopy study to Mayor Craig Greenberg, Envirome Institute researchers, and more than 75 community leaders at Spalding University’s Egan Leadership Center.
The study builds on Louisville’s groundbreaking 2016 heat risk assessment—the first of its kind for a major U.S. city. In addition, Louisville is the first city to have commissioned a follow-up study. The findings showed that afternoon temperatures increased in nearly two-thirds of Louisville neighborhoods between 2016 and 2024, with some areas warming by more than 10°F and experiencing temperatures up to 20°F hotter than neighborhoods with greater tree canopy.
Researchers also found that planting trees in just 50% of the available planting spaces could lower average afternoon temperatures by 1.8°F, with some neighborhoods cooling by as much as 7°F. These findings will help guide Greenprint and other urban forestry efforts to reduce extreme heat, improve public health, and better manage stormwater while strengthening Louisville’s climate resilience.
A new StoryMap from our Urban Design Studio team provides an overview of the new heat risk and mitigation data and highlights some of the insights that can be derived from it. Please contact Sean Willis (cc’d here) if you’d like access to the data.
To learn more about the Greenprint initiative, visit: https://udstudio.org/greenprint
Truth to Power airs every Friday at 9pm, Saturday at 11am, and Sunday at 7pm on Louisville's grassroots, community radio station, Forward Radio 106.5fm WFMP and live streams at https://www.forwardradio.org