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.
(..) Loki. JANE: Malekith is going to fire the Aether at a spot where all the nine worlds are connecting. Amplifying the weapon's impact. For each additional world, the power will increase exponentially. The effect would be universal. But the Alignment (..)2013 Thor: The Dark World