WATCH: Why Vermont banned a controversial weed killer

Vermont this week became the first US state to ban paraquat, a widely used herbicide that researchers have linked to an increased risk of Parkinson’s disease. The new law takes effect November 1 and includes limited exemptions for certain crops through 2030. Supporters say the move protects public health, while critics argue more research is needed and worry about impacts on farmers.

Read the full story: With governor’s signature, Vermont becomes 1st in nation to ban weed killer linked to Parkinson’s disease