The National Audubon Society, along with partners, established the first Lights Out program in 1999 in Chicago. Philadelphia joins 33 other cities including New York, Boston, Atlanta and Washington, D.C.

The annual shift to daylight saving time happens this weekend, with clocks jumping forward an hour at 2 a.m. Sunday. While loads of digital devices make the switch automatically, the process of resetting biological clocks is still a chore.

An American woodcock, one of the earliest migratory arrivals in Chicago, is recovering from a head wound and broken clavicle after colliding with a building in Chicago.

Batten down the hatches, or at least secure lightweight objects outdoors. There’s a wind advisory in effect Wednesday.

Tuesday’s weather was one for the record books, with the mercury at O’Hare hitting 69 degrees, tying the highest temperature for March 9 set back in 1974, according to the National Weather Service. 

The legal wrangling over the Obama Presidential Center’s construction in Jackson Park is far from over, opponents say. Meanwhile, the Obama Foundation has just revealed a new architectural detail about the center’s tower.

Registration is open for the Chicago Park District’s spring session, including its aquatics programs and spring break camps for children 6 to 12 years old.

Chicago Bird Collision Monitors is recruiting volunteers to help rescue birds injured or stunned while navigating their way through downtown’s maze of confusing lights and glass buildings.

The Chicago Ornithological Society has resumed small group bird hikes. Masks are a must, as is social distancing. 

Food waste has become a growing concern because of the environmental toll of production, including the land required to raise crops and animals and the greenhouse gas emissions produced along the way. 

For months, Dan O’Conor has shocked his senses by leaping into Lake Michigan — every day. What was prompted last June by a hangover is now an opportunity for the Lincoln Square resident to help the city’s music scene. We meet up at Fullerton Beach to see him in action.

Global energy-related carbon dioxide emissions fell in 2020 by the largest annual percentage since World War II due to the coronavirus pandemic. But the drop-off appears to be short-lived, according to a report from the International Energy Agency.

Dr. Lester Fisher has led a remarkable life, from taking care of Gen. George Patton’s bulldog Willie during his service in World War II to a more than four-decade association with Lincoln Park Zoo, where he started out as a part-time veterinarian. 

After self-imposed winter breaks, Lincoln Park Zoo and Brookfield Zoo are reopening to guests, with a number of safety precautions in place due to the coronavirus. Here’s what to expect.

Reports that millions of 17-year cicadas will emerge from underground in the Chicago area this spring aren’t true. They’re coming in 2024. 

Forget Duke versus North Carolina. This annual contest raises the rivalry stakes, pitting species against species in this annual winner-takes-all online tournament that’s as educational as it is weird.