Environmentalists have been taken aback by a campaign ad in which Gov. J.B. Pritzker touts the expansion of Rockford Airport, which will demolish an 8,000-year-old remnant prairie.

The teams behind each Chicago casino proposal were asked how they plan to incorporate bird-friendly elements into their architecture. Some tipped their hand, others kept their cards close to their vest. 

For the hundreds of thousands of Chicago Public Schools students kicking off their spring break Friday, it’ll look more like a snow day.

Methane is a big contributor to climate change, leading to about a 0.9 degrees Fahrenheit (0.5 degrees Celsius) increase in temperature since the 19th century, according to the Intergovernmental Panel on Climate Change. Carbon dioxide has caused about 50% more warming than methane.

NextEra Energy subsidiary ESI Energy pleaded guilty to three counts of violating the Migratory Bird Treaty Act during a Tuesday court appearance in Cheyenne, Wyoming. It was charged in the deaths of eagles at three of its wind farms in Wyoming and New Mexico.

Artist Ben Miller cast a portrait of the Chicago River using just fishing gear. Here’s the big reveal.

According to the latest report on climate change, we’re still not doing enough to curb greenhouse gas emissions. There’s a way forward, but action can’t wait, scientists say.

Artist Ben Miller uses a unique technique called fly cast painting. He’ll be demonstrating it Sunday on the Riverwalk as he creates a portrait of the Chicago River.

The city’s commitment of $6 million to the Englewood Nature Trail is part of a total of $15 million announced by the mayor to jump-start a number of “green infrastructure” projects throughout Chicago.

The Sun put on a spectacular show Wednesday, emitting a “significant solar flare,” according to NASA. Now scientists are bracing to see what the resulting space weather will have in store for Earth.

Brookfield Zoo is celebrating the arrival of an adorable baby porcupine. We had to know: How do mama porcupines give birth safely? 

Scientists say global emissions need to drop 45% by the end of the decade compared to 1990 levels. But recent data show they are going up, not down, in part due to rising energy demand and the expansion of fossil fuel use.

If a casino is coming to the riverfront, publicly accessible open green space should be a priority, as well as considerations for wildlife habitat, environmental advocates say. And the buildings themselves should be held to the highest standards of sustainability and climate resiliency.

Earth Hour started as a simple “lights out” message to draw attention to climate change but has become a global call for environmental action.

A new study led by the Field Museum shows that a number of bird species are laying their eggs nearly a month earlier than 100 years ago, likely due to climate change.

The strain of highly pathogenic avian influenza circulating in the U.S., the first since 2016, doesn’t appear to pose a threat to humans, but is highly contagious among birds and often fatal.