Are now frontline responders in the battle against climate change: fighting raging wildfires, helping urban dwellers overcome extreme heat, and rescuing victims of rising seas. What is less known is that firefighters are being exposed to a toxic soup of chemicals from melting flat-screen TVs to nylon carpets, each time they respond to a residential fire. I talk with Tom O'Connor, Battalion Chief with the San Francisco Fire Department, about how firefighters are leading the charge to clean up our planet one community at a time.