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.

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.

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.

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

Aleksandra Plewa and Peter Proctor's startup, EcoShip, collects used shipping materials and redistributes them to small business owners – for free. 

In the wake of the decision to reject a permit for a metal shredding and recycling operation on the city’s Southeast Side, environmental justice advocates say now is the time for the city and industrial leaders to work together and find ways to meet the needs of both the community and corporations.

The infusion from the bipartisan measure enacted in November, combined with annual funding through an ongoing recovery program, will enable agencies by 2030 to finish work on 22 sites designated a quarter-century ago as among the region's most degraded. 

Lake scientists have long considered winter a season when aquatic activity slows. But researchers now think more is going on in the bitter depths than previously believed — including activity influenced by climate change. 

Mayor Lori Lightfoot did not respond to a question from WTTW News about whether she thought it was appropriate for her appointees to reject the inspector general’s recommendation to fire an employee of the Chicago Department of Public Health and punish two other employees of the Department of Buildings responsible for approving and overseeing the implosion of the smokestack.

Forget about napkins and ketchup packets too. On Tuesday, Chicago's single-use foodware ordinance will go into effect, meaning disposable utensils will no longer be included with a take-out or delivery order unless specifically requested by the customer. 

The first report from interim Inspector General William Marback disclosed that Mayor Lori Lightfoot’s administration declined to fire an employee of the Chicago Department of Public Health or punish two other employees of the Department of Buildings responsible for approving and overseeing the implosion of the smokestack.

What if our cities could be more like forests? That’s the question at the heart of a new building prototype developed by architecture and engineering firm Skidmore, Owings & Merrill.

Chicago has a long history of segregation and racial inequity. Now, a new data analysis by the DePaul University Center for Journalism Integrity & Excellence shows inequity is rooted even in the planting of city trees.

Three mayors in the past 15 years have all promised to combat the effects of global climate change. But some critics and scientists, along with a new data analysis by the DePaul University Center for Journalism Integrity & Excellence, reveal their efforts have fallen short. 

Chicago is set to invest $46 million in tree planting over the next five years. Trees can help improve air quality, reduce flooding, and offer several other health and social benefits. But the distribution of trees throughout Chicago is far from equal.

So little prairie still exists in Illinois, most residents of the state have never encountered this rare landscape. Here, then, is an introduction.