In one of the nation's hottest cities, bags of ice are helping save lives

Extreme heat is the deadliest weather-related threat in the U.S.

In Phoenix, heat kills more people than homicides each year.

So the city is turning to an unlikely lifesaver: bags of ice.

And the fire department is creating a new model in the battle against heatstroke.

For our series, Tipping Point, Ben Tracy of Climate Central shows how this low-tech approach is saving lives.