These tall chimneys billowing thick, toxic smoke stand on the banks of the Saint Clair River, on the outskirts of the Canadian city of Sarnia, in Southwestern Ontario. Stretching for over 30 kilometers along the riverbank from the southern tip of Lake Huron to the village of Sombra, this region has been nicknamed the Chemical Valley, because of the large concentration of petroleum and chemical factories that are packed together here, elbow-to-elbow, within an area the size of a hundred city blocks. Sarnia’s Chemical Valley is home to sixty-two chemical plants accounting for nearly 40 percent of Canada's chemical industry. These industrial complexes are the heart of Sarnia's infrastructure and economy, creating —directly and indirectly— more than fifty thousand jobs in the area.

Photo credit: P199/Wikimedia