A homeless man is treated for heat stroke in Shoreline (Washington), July 26 2022.  Credit: David Ryder / Getty / AFP

An area of intensely warm weather — a so-called “extreme heat belt” — with at least one day per year in which the heat index hits 125 Fahrenheit (52C), is expected to cover a US region home to more than 100 million people by the year 2053, according to a new study.

The research, carried out by nonprofit First Street Foundation, used a peer-reviewed model built with public and third-party data to estimate heat risk at what they called a “hyper-local” scale of 30 square meters.

First Street Foundation’s mission is to make climate risk modeling accessible to the public, government and industry representatives, such as real estate investors and insurers.

A key finding from the study was that heat exceeding the threshold of the National Weather Service’s highest category — called “Extreme Danger,” or above 125F — was expected to impact 8.1 million people in 2023 and grow to 107 million people in 2053, a 13-fold increase.

This would encompass a geographic region stretching from northern […]

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