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Monarch butterflies have started their 2,000-mile migration south to Mexico. (Patty Wetli / WTTW News)

The annual migration of monarch butterflies is currently at its peak in the Chicago area. Several roosting sites have been spotted around town as the creatures use the city as a pit stop on their 2,000-mile journey to Mexico.

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Chicago’s Southeast Side. (WTTW News)

We speak with Angela Tovar, the city’s recently named sustainability officer, about a new air quality ordinance and improving Chicago’s environment.

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Floating habitat being positioned on the Chicago River. (Shedd Aquarium / Brenna Hernandez)

Rafts loaded with plants floated down the Chicago River last week, a strange sight that in decades past might have been the result of some sort of bizarre garbage spill but these days is a sure sign of the waterway’s ongoing “re-wilding.”

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(WTTW News)

Following a May explosion, General Iron has put appropriate controls in place to resume its metal shredding operation, experts say. Neighbors say they have little faith in the company’s commitment to compliance.

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Faith E. Briggs, in a scene from “This Land,” part of a virtual screening event. (YouTube)

The organization Environmentalists of Color is teaming up with the One Earth Film Fest to screen a pair of films focusing on the theme of “Outdoors While Black: Unpacking History, Reframing Safety & Taking Action.”

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Mayor Lori Lightfoot’s new report on air quality shows that while air pollution is a problem across the city, it’s worse in some neighborhoods than others. What her administration is planning to do about it.

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The Office of Inspector General has released a report on Streets & San's weed-cutting performance. (Bart Everson / Flickr)

An audit by the Inspector General’s Office found numerous flaws in the Department of Streets and Sanitation’s system of clearing weeds from vacant lots, including the lack of an up-to-date list of city-owned vacant property.

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(WTTW News)

July in Chicago brings scorching summer heat to the city, and often with it, poor air quality.

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Eco House’s Englewood farm site. (Patty Wetli / WTTW News)

Eco House is planting the seeds for a homegrown flower industry on vacant lots in Englewood, Woodlawn and West Garfield Park. We learn about the mission behind this slow flowers movement.

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In this Oct. 5, 2016, file photo, heavy equipment is seen at a site where sections of the Dakota Access pipeline were being buried near the town of St. Anthony in Morton County, N.D. (Tom Stromme / The Bismarck Tribune via AP, File)

A judge on Monday ordered the Dakota Access pipeline shut down for additional environmental review more than three years after it began pumping oil — handing a victory to the Standing Rock Sioux Tribe.

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Protesters outside the North Side home of MAT Asphalt owner. (Neighbors for Environmental Justice)

Environmental activists from the city’s Southwest Side brought their ongoing fight against MAT Asphalt to the North Side front yard of owner Michael Tadin Jr. on Thursday night.

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General Iron's Lincoln Park facility. (WTTW News)

Over the objections of environmental activists, the Illinois Environmental Protection Agency on Thursday issued a construction permit to General Iron, allowing the company to move its metal-shredding operation from Lincoln Park to the Southeast Side. 

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Regal fritillary butterfly. (Doug Taron)

Similar in size to the monarch, the regal fritillary is also a stunner in the looks department, but the native prairie butterfly has nearly disappeared from Illinois. To save this pollinator, we need to save the prairie.

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The partly demolished site of the former Crawford Power Generating Station, which was active from 1925 to 2012. (WTTW News)

City officials confirmed Friday afternoon that Hilco Global is now allowed to move forward with construction.

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Angela Tovar (Courtesy of the City of Chicago)

Angela Tovar, a Chicago native who grew up in the South Chicago community, has been named the city’s chief sustainability officer.

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Retail businesses in South Chicago sustained property damage during recent incidents of looting. (WTTW News)

On the Southeast Side, a community deals with the aftermath of property damage and looting against the backdrop of ongoing concerns over COVID-19 and environmental pollution.