Each year brings more destructive natural disasters and growing evidence of the challenging future we face if we don’t address climate change. But the biggest cause of climate-related deaths is one that’s hard to see and hardly talked about. Extreme heat killed more than 2,000 people in the United States in 2023 and put intense stress on millions as they faced high costs of utilities and numerous life interruptions. Federal, state and local policy hasn’t kept up with rising temperatures and the scale of the heat threat, and cities are scrambling to adapt and prevent more deaths. In this panel from the 2024 Aspen Ideas Festival, the chief heat officer for Miami-Dade County, Jane Gilbert, joins the chief heat officer for the city of Los Angeles, Marta Segura, to share their learnings and innovations in these brand new positions. Rolling Stone journalist Jeff Goodell, the author of “The Heat Will Kill You First,” brings a wider lens to the issue. NBC News correspondent Liz Kreutz moderates the conversation.

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