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(NASA)

Is rhetoric edging us closer to doomsday? Last week, the Doomsday Clock edged 30 seconds closer to midnight, putting the world two and a half symbolic minutes away from global annihilation. 

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(Solar Energy Industries Association)

Cook County is more than halfway through a multiyear project that aims to make solar energy more affordable for residents.

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On Thursday, the Illinois Environmental Council released its Environmental Scorecard, highlighting the top pieces of environmental legislation (and legislators) from 2016. 

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(Justin Hobson / Wikimedia Commons)

The increasing frequency of tornadoes, and a new study on gun violence. Those stories more from the world of science with Rabiah Mayas.

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The decadeslong fight to clean up the Chicago River took a step forward last week with the resolution of two lawsuits targeting phosphorous discharge that has polluted waters from Chicago to the Gulf of Mexico.

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(Daniel Dionne / Flickr)

Dozens of Chicago activists met last week to plan a defense of environmental policies that appear vulnerable under the administration of President Donald Trump.

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Peggy Notebaert Nature Museum's alligator snapping turtle, Patsy McNasty, moved into a bigger tank Jan. 19. (Alex Ruppenthal / Chicago Tonight)

Alligator snapping turtle Patsy McNasty moved into a new 300-gallon tank this week at Chicago's Peggy Notebaert Nature Museum, where visitors attended a “housewarming” event for the 14-pound turtle. 

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A regal fritillary butterfly, a local species that’s classified as threatened in Illinois.

Over the course of its history, the Peggy Notebaert Nature Museum has amassed a collection of about 390,000 animal specimens and artifacts. We get a close look at five of these rarely seen items.

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Pollution causes 10 million deaths per year, according to an upcoming report written by 50 researchers and policymakers, including Chicago-based energy experts.

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Eugene Cernan (NASA / Facebook)

The Chicago native died Monday afternoon at the age of 82.

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Cook County Board President Toni Preckwinkle

Cook County is ahead of schedule on its goal to reduce greenhouse gas emissions 80 percent by 2050, a new report shows.

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Amazon Echo (Adam Bowie / Flickr)

Amazon’s voice-activated digital assistant is a hot seller, but there are privacy issues.

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Why did the Trump transition team target Department of Energy staffers who worked on climate change? What does the future hold for climate research and nuclear weapons? A one-on-one interview with the current U.S. Secretary of Energy.

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(Chicago Tonight)

Chicago’s air traffic controllers and the pilots they guide have a new way of communicating that officials say will improve speed and safety. We explain how it works.

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(Chicago Tonight)

Why aren't Chicagoans getting on the recycling bandwagon? What city officials are doing to reverse dropping participation rates.

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The animal welfare team at Brookfield Zoo tends to Zenda, a 10-year-old male lion who appeared to have a toothache. (Chicago Tonight)

What happens when a lion gets a toothache? Meet the large and dedicated team that cares for more than 3,000 animals at Brookfield Zoo. 

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