<human>: Is there any evidence that the fracking boom in North Dakota has harmed water supplies in the state?
<bot>: Yes, there is some evidence that the fracking boom in North Dakota has had a negative impact on water quality and quantity. In particular, studies have shown that increased drilling activity has caused an increase in air pollution from oil and gas operations which can lead to reduced visibility and potential health impacts for people living nearby. Additionally, groundwater contamination due to spills or leaking wells has been reported as another potential risk of hydraulic fracturing.