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.
(..) I mean, what if he looks like me? Or worse... what if looks like me? Not to mention the impact on our social circle. Everything's going to change. Howard won't be able to come over as much. Well, he could bring the baby here. Oh, but then we'd have to (..)2016 TvShow: The Big Bang Theory Title: The Positive Negative Reaction Season: 9 Episode 16