During his speech at the National Republican Congressional Committee dinner, Trump said:
If you have a windmill anywhere near your house, congratulations, your house just went down 75% in value. And they say the noise causes cancer.
It's unclear who they are in terms of the people who say the noise from windmills causes cancer, but it's certainly not scientists. Trump didn't provide any factual evidence to this claim, but he did add that birds don't like the noise and said:
If you loved birds, you'd never want to walk under a windmill again.
A 2014 study found that wind turbines aren’t even close to being the biggest bird killers; that honor belongs to cats, which kill more than 2 billion birds a year in the US and Canada, followed by cars and power lines, which together kill more than 600 million. Wind turbines kill about half a million birds every year, according to the study, less than 0.25% as many as cats do. Some wind turbines have also been redesigned to be shorter, keeping out of birds’ migration and feeding paths.
Donald Trump has always been vocal in his passionate hatred of windmills