Thunder Bay is working on a plan of attack against the Emerald Ash Borer. The invasive pest will be in Thunder Bay within the next five years and could devestate the City's urban forest. Forestry Program Specialist Rena Viehbeck says there are two options. One of the options is to inject an antibiotic into some of the emerald ash in the city. Viehbeck says the other option is to do nothing and replace the trees when they die. Urban Forester Shelly Veccio says it could kill all of the ash trees within the city.