Studies show temperatures of -30°F will kill 98% of ash borer beetle larvae. Guess when Chicago was last that cold.

According to a federal report released Monday, the U.S. experienced 20 billion-dollar weather and climate disasters in 2021, including hurricanes, wildfires and out-of-season December tornadoes.

It can be hard to tell one tree from another in winter, but there's a simple trick to identifying invasive buckthorn. 

Skokie Lagoons may look like an oasis of green but a lot of that lush vegetation is actually an invasive species called European buckthorn. WTTW News tagged along as a group of volunteers charged into the thicket and tackled this enemy. 

In response to concerns about putting a see-through glass tower in the path of migrating birds, Carvana revised its plan to incorporate bird-friendly components. Critics called the proposed mitigations “woefully inadequate.” 

Chicagoans woke up Friday to sub-zero temperatures, the first time in nearly a year the mercury has dipped into the negatives. In anticipation of the cold snap, officials issued reminders and tips.

Chicago’s Christmas tree recycling event kicks off Saturday and runs through Jan. 22 at 26 parks. The program keeps hundreds of thousands of pounds of trees out of landfills.

Melting glaciers, deadly floods in Germany, record high summer temperatures in generally mild Oregon, more urgent pleas for help from Pacific island nations. With growing urgency, the effects of climate change were felt around the world in 2021.

The National Weather Service on Tuesday said that as of 12:10 p.m., one-tenth of an inch of snow had been recorded at O’Hare Airport — Chicago’s official weather site — making the first measurable snowfall in 287 days.

The National Weather Service is forecasting a "burst of wet snow" on Tuesday and a chance of light snow on Wednesday, which could bring Chicago's snow-free streak to an end.

Did you know wrapping paper isn’t recyclable in Chicago? Read on for more tips on how to deal with post-holiday waste.

For an animal immortalized in literature, song and film, the reindeer has done a remarkable job of, pardon the pun, flying under the radar.

The highly anticipated launch of the James Webb Space Telescope has been delayed multiple times.

Marginalized people often suffer the most harm from unintended consequences of new technologies, according to researcher Breigha Adeyemo who shares ways to make them more inclusive. 

NASA prepares to launch the most powerful space telescope ever. Local astronomers share some up-close details. 

Celebrate the winter solstice Tuesday at a solar gazing event on the 606 Bloomingdale Trail, which boasts a solstice “notch” to frame sunsets.