Reggie Carrillo knows firsthand that where you live can determine how hot your neighborhood gets.
The environmental activist and educator resides in a largely Mexican American area of south-central Phoenix, where segregation once forced Black and Hispanic people to live south of the railroad tracks. More than a half century later, the historic lack of investment means fewer trees and subsequent temperatures 13 degrees F (7 C) higher than wealthier, leafier neighborhoods just a few miles away.
