CLIMATE CHALLENGESMost Major U.S. Cities Underprepared for Rising Temperatures

Published 20 June 2022

This month, Denver, Las Vegas and Phoenix all posted record high temperatures. And across the nation, Americans are ramping up for a scorching summer. Yet despite more frequent and intense heat waves on the horizon, cities are underprepared to deal with the challenge.

This month, Denver, Las Vegas and Phoenix all posted record high temperatures. And across the nation, Americans are ramping up for a scorching summer. Yet despite more frequent and intense heat waves on the horizon, cities are underprepared to deal with the challenge, according to a UCLA-led research team.

Their new study, published in the journal Environmental Research Letters, analyzed municipal planning documents from 50 large cities across the country. The researchers found that 78% of these cities’ climate plans mentioned heat as a problem, but few offered a comprehensive strategy to address it. Even fewer addressed the disproportionate impact heat has on low-income residents and communities of color.

“Just a couple of years ago, very few cities were talking about preparing for rising temperatures, so it’s an important step that heat is becoming a larger part of the conversation,” said V. Kelly Turner, lead author of the study and co-director of the UCLA Luskin Center for Innovation. “But without concrete steps to protect residents, cities are lagging behind the problem.”  

Heat, exacerbated by climate change, has become one of the deadliest weather hazards in the nation, the researchers said, accounting for more deaths in a typical year than hurricanes, floods or tornadoes. In California, according to a recent Los Angeles Times  investigation, heat killed some 3,900 people between 2010 and 2019. And UCLA research has shown that heat leads to more preterm births, makes it more difficult for students to learn and increases the risk of injuries to workers on the job (PDF).

Despite these damaging and wide-ranging effects, governance for heat has historically fallen behind other climate change–related hazards.

To assess heat planning, the researchers — from UCLA, Arizona State University and the University of Southern California — examined 175 municipal plans from the 50 most populous cities in the United States, drawing from an open-source database they created. They conducted a content analysis to understand the types of solutions and interventions cities proposed in response to heat and why.

The team found that, overall, solutions to rising temperatures didn’t match the severity or complexity of the problem. How municipal plans framed the issue of urban heat, they said, strongly influenced how cities addressed it, and in most cases limited the scope of their approach.