From the shores of Lake Michigan to the forests of the Shawnee, Illinois is a state rich in natural beauty. We are committed to protecting the diversity of our state's natural resources through campaigns on conservation, energy issues, clean water, and transportation.
Volunteer with us, become a member, or donate and help us protect the water, air, land and wildlife in our beautiful state.
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Welcome to the Illinois Chapter of Sierra Club!
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Local News and Information
Sierra Club Illinois Announces Endorsement of JB Pritzker and Christian Mitchell
September 16, 2026
“Under JB Pritzker, Illinois has become a national leader in acting on climate change”Chicago, IL. -- Today, Sierra Club Illinois announced its endorsement of Governor JB Pritzker and Christian Mitchell for Governor and Lieutenant Governor."Sierra...
Bringing POWER to Bear on Data Centers
June 5, 2026
As the dust settles on the spring session of the Illinois General Assembly, the lack of action on the threats posed by the multitude of power hungry data centers is certainly frustrating. However, progress may be sooner than it seems,...
Sierra Club Heads to the POWER Act Lobby Day
May 21, 2026
In the first episode of the series Extrapolations, a real estate developer is pushing to expand in the Arctic. The once pristine area is now accessible due to climate related melting, and his colleague points out the horrific damage they are causing...