Chicago takes part in Earth Hour
Millions of people turned out their lights Saturday night for Earth Hour.
It was created out of concern for the environment.
Lights went out in the Chicago area at 8:30 p.m.
Many city landmarks joined in on the energy-saving initiative, including the Chicago Theater, Navy Pier and the Willis Tower.
Earth Hour started in one city in 2007.
It’s now celebrated in 7,000 cities throughout 152 countries.