Sierra Club Ontario is a grassroots volunteer-driven organization, and the provincial Chapter of Sierra Club Canada. Our most important work is accomplished by member-volunteers. We have active groups of volunteers working together in Ontario communities like Sierra Club Peel (Mississauga, Brampton & Caledon area), Niagara and our Great Lakes Section. We provide a framework within which you, as a member, get to decide for yourself what campaigns you'd like to pursue and how you'd like to contribute.