The Citizens Environment Alliance (CEA) is a non-profit, grass-roots, international, education and research organization. We are committed to an ecosystem approach to environmental planning and management.

The CEA was formed in 1985 by citizens concerned about spills from the (Sarnia) Chemical Valley into the St. Clair River (the Toxic blob), and how those spills affected the region's drinking water. Later, the CEA began to focus on the questions of toxins in the Great Lakes, as well as air quality throughout the transboundary area.

As the group has grown, so too have the issues of concern. These now include waste management, wetland and natural areas protection, environmental land use planning, energy use and the long-term implications of economic growth on the environment. The Alliance's annual activities since its inception have aimed at increasing public knowledge of the area ecosystems and the impact humans have on these systems.