This is the story of one of the most powerful and effective community initiatives in the history of North America. It started with one lone voice in 1984. Dr. June Irwin, a dermatologist, noticed a connection between her patients’ health conditions and their exposure to chemical pesticides and herbicides. With relentless persistence she brought her concerns to town meetings to warn her fellow citizens that the chemicals they were putting on their lawns posed severe health risks. Her persuasive arguments and data to back her findings eventually led the town of Hudson to enact a by-law that banned the use of all chemical pesticides and herbicides. The most mighty chemical companies in North America fought the tiny town and eventually the case made it to the Supreme Court. The movement spread so far and wide that the entire province of Quebec enacted a ban and Home Depot stopped putting the dangerous pesticide products on their shelves. A Chemical Reaction is an inspiring story of overcoming great odds and demonstrates the power of people coming together to effect great change in our society.