"have negative impacts" is correct and usable in written English.
Example sentence: The over-fishing of certain species of fish has had negative impacts on the marine ecosystem.
Will increasing monoculture production have negative impacts on biodiversity?
A message that will have negative impacts for some".
Serious water shortages have negative impacts on regional socioeconomic development.
Unintended pregnancy may have negative impacts on maternal health.
He warned that the response by plants could have negative impacts across the natural world.
If you use enough of it, the sodium chloride will have negative impacts on some plants".
This will then have negative impacts on fish populations and other plants in the area.
However, there will be remaining risks around a longer term default which would have negative impacts on the Argentine economy.
"The bank cannot turn a blind eye to this, saying the credit it gives does not have negative impacts".
Policies like trade, investment and energy do have negative impacts on people in developing countries that need to be addressed.
But hard structures can, as the report put it, "have negative impacts on the physical and aesthetic characteristics of beaches".
