What We Do

At the Colorado Sierra Club, we know that the health of our environment shapes the health of our communities. Our members work tirelessly to protect the earth’s vital resources, natural beauty, wild creatures, and scenic landscapes, and our voices influence leaders and transform how industries are powered.

The Colorado Sierra Club provides a home to volunteer-driven teams building grassroots power by engaging new people, nurturing new leaders, diversifying the movement, and making meaningful progress on conservation goals. Join us in embracing bold, positive, and future-focused solutions to the climate crisis. 

Activists gather at a public lands rally

Climate and Energy

At the Colorado Sierra Club, we are dedicated to tackling the complex climate and energy challenges facing our state. Our incredible staff and volunteers work tirelessly to address the harmful impacts of fossil fuel extraction while advancing...

Lands, Water, Wildlife

Do you love the great outdoors? Are you looking for ways to give back and make a difference? Are you into public displays of afforestation?  Join our Guardians of the Great Outdoors Team to contribute to Colorado Sierra Club’s conservation...

Legislative Lobbying

Available now: Check out our 2026 Legislative Scorecard to see how your Representatives voted. To compare, our 2025 Legislative Scorecard is available as well. The Colorado Sierra Club is very active at the State Capitol. We support measures...
An oil pump jack with mountains sprawling in the background

Big Oil Accountability

Big oil companies have known for decades that their fossil fuel products could cause catastrophic consequences, but they lied to the public to protect their profits. Today, Coloradans are paying for the fallout of that deception.Climate change today...