Going dark in Chicago could save thousands of birds

Chicago doesn't have to become a graveyard for migratory birds every spring. There's a simple solution to save these seasonal visitors. The big picture: Chicago's Lights Out Campaign encourages buildings 40 floors and higher to turn off their lights from 11pm until sunrise. The lights throw off the birds' navigation, leading them to swarm and die from exhaustion or slam into the buildings. Why it matters: Chicago is often considered the...