A San Francisco-based tech startup has announced the launch of the latest tool in the fight to stave off the worst of climate change: genetically modified trees.

A winter weather advisory has been issued for 6 a.m. to 9 p.m. Thursday in the Chicago area. Slippery pavement will be a bigger issue than snow accumulation.

The Chicago Park District Board of Commissioners voted unanimously in favor of landmark status for Promontory Point.

Using a 13-foot pencil-shaped robot that swam under the grounding line where ice first juts over the sea, scientists saw a shimmery critical point in Thwaites’ chaotic breakup, “where it’s melting so quickly there, there’s just material streaming out of the glacier.”

In what’s become an annual tradition, staff at Brookfield Zoo handed out Valentine’s Day treats to several animals this holiday. The reactions were priceless.

As a more complete, and complex, portrait has emerged of John James Audubon, birders and ornithologists have struggled to reconcile their missions with the troubling aspects of his legacy: buying and selling slaves, plagiarism and the exploitation of natural resources.  

During press interviews held after WTTW's mayoral forum Tuesday evening, challengers to Mayor Lori Lightfoot pledged to reestablish a Department of Environment — disbanded in 2011 under Rahm Emanuel — if elected.

Road salt runoff is making its way into Great Lakes waterways. Wisconsin has pending legislation that could encourage contractors to use less.

The Commission on Chicago Landmarks has given Promontory Point preliminary landmark status. But the Park District board needs to consent to the designation as the next step in the process. 

“There are places you walk where you see sky touching the earth, and you can imagine this as the gateway to the Grand Prairie,” site steward Pat Hayes said of Orland Grassland.

With Valentine’s Day around the corner, animal rights advocates are asking the Cook County Forest Preserve District to have a heart and release “Rocky” the coyote.

Crews released toxic chemicals into the air from five derailed tanker cars that were in danger of exploding  and began burning it after warning residents near the Ohio-Pennsylvania state line to leave immediately or face the possibility of death.

Authorities feared the death toll would climb as rescuers searched through tangles of metal and concrete for survivors in a region beset by more than a decade of Syria’s civil war and a refugee crisis.

New research shows bison are altering the landscape in unexpected ways when reintroduced to Midwest prairie ecosystems. 

Chicago has announced the winners in its “name that snowplow” contest. Did your favorite make the cut?

Late winter is coyote mating season, which reaches its peak toward the end of February. That's leading to more sightings than usual by humans — even in downtown Chicago — as the animals are a bit bolder and on the move in their search for a soulmate.