Experts from the American Security Project are in Chicago to sound the alarm that inaction on climate change weakens the United States' national security position. We'll talk with retired U.S. Navy Vice Admiral Lee Gunn and Andrew Holland, senior fellow with the American Security Project and a former aide to ex-Secretary of Defense Chuck Hagel during Hagel's time in the Senate.

Pope Francis' recent views on climate change are sparking debates within the Catholic community. Joining us are Mark Potosnak, a member of the Catholic Climate Covenant and assistant professor of environmental science at DePaul University, and Mary Anne Hackett, president and CEO of Catholic Citizens of Illinois.

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.  

Most scientists believe that climate change is real and man-made, but the policy debate over how to address the problem is often lacking in conservative voices. Former U.S. Rep. Bob Inglis, a Republican, has been an advocate for free-market solutions to climate change. Inglis joins Chicago Tonight for a conversation.

Chief meteorologist at WGN Tom Skilling co-authored an op-ed in the Chicago Tribune regarding climate change and the potential effects of inaction. We discuss the issue with him tonight. 

What does climate change and national security have to do with each other?  Everything according to science and military experts. We take a closer look on Tuesday’s Scientific Chicago.

We talk with Former Secretary of Energy Steven Chu about climate change, fracking and the future of energy policy. Watch a web extra, extended interview with Chu.

Artists look at the environment and create beauty out of uncertainty. We take another look at a local exhibit.

Artists look at the environment and create beauty out of uncertainty. We get a preview of a local exhibit.

A new report finds that warming temperatures are having an impact on five national parks on the Great Lakes. Elizabeth Brackett looks at what that could mean.