Inside the fight against urban heat

As the earth heats up, cities made hot by concrete are getting even hotter. The City of Los Angeles has declared war on rising temperatures. But the city still has a long ways to go.

This story was made possible with support from the Center for Health Journalism at the University of Southern California.

Photo:  Los Angeles city workers spread "cool pavement" material that, once dried, immediately cools the ground 15-20 degrees. (Molly Peterson)