Not that long ago, air pollution from burning coal made the Windy City more like the Smoggy City. Geoffrey Baer tells us how Chicago cleaned up its act, and shares other stories about Chicago history in this encore edition of Ask Geoffrey.

Meet an entrepreneur who is helping Chicagoans compost while growing his business–all by the seat of his bicycle.

A recent report from the Obama administration warned that changes to the climate could lead to thousands more Americans dying prematurely every year from a variety of causes. Local scientist and professor Seth Darling discusses the challenges of climate disruption and shares his thoughts on creating a path to a sustainable future.

Michigan Gov. Rick Synder is facing calls to resign over his administration's bungled handling of the contaminated water crisis in Flint. A former high-ranking official at the Environmental Protection Agency tells us what she thinks went wrong.

New reports show that Earth’s surface temperature last year was its highest since modern temperature record keeping began in 1880. The global record was also broken in 2014, although 2015 saw dramatic increases by comparison.

Pope Francis released an encyclical on the environment on Thursday. In the 192-page encyclical, the pope makes the case for a partnership between science and religion to fight climate change.  

City Council members move forward on a plan to ban plastic bags at grocery stores. Paris Schutz has the latest.