"have impacts" is correct and can be used in written English
You could use it in a sentence such as: "Climate change is causing rising sea levels that have impacts on coastal communities."
Businesses have impacts on the environment and society.
Many human activities may have impacts of similar scope.
This move could have impacts on both ends of the fabric life chain.
These substances may prove to have impacts, probably deleterious, on lifespan.
While the outcome and impact of this referendum remains uncertain, this could have impacts on our operational and financial results.
"Climate change overseas could have impacts on the UK, greater than that from climate change at home.
In Minnesota, an administrative hearing resulted in a judicial recommendation that will have impacts across the country.
"Their capital assets last decades, so investment made now will have impacts on their emissions in 20, 30 or 40 years," Faria said.
As I joined in 2007, the Northern Rock collapse was unfolding, heralding the broader financial crisis that was to have impacts on all areas of society.
"That's a case where the short-notice reports on foliage have impacts," said Rolf Hammer, the owner of the Homestead Inn in New Milford.
When hundreds or thousands of species or insect are being wiped out, it's going to have impacts on bats, shrews, hedgehogs, you name it.
