We hope that these programs will have a positive 'impact on' the community. [=will help the community]
The stress of her job is having a negative 'impact on' her health. [=is harming her health]
We need to be concerned about the environmental 'impacts' of all this construction.
(..) events surrounding Derek's incarceration. How these events helped shape your present perspective... ...concerning life in contemporary America. The impact on your life. Your family's. Whatever you wanna say, Danny... ...I'll be the only one reading it. But if it's not on my desk... (..)1998 American History X