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.
(..) Miss Teschmacher! Radar contact strong. Miss Teschmacher! Radar report Navy Bird. San Andreas area. Navy Bird heading down, seconds to impact. seconds and counting. A military missile has exploded in the Southern California desert. The force of the explosion has activated the San Andreas fault. (..)1978 Superman