* Sand dunes can help to protect coastal areas from erosion and storm damage.
* Dunes can also provide a habitat for plants and animals.
* In some cases, sand dunes can even help to improve air quality.
* Sand dunes can also be a hazard to human life and property.
* Sand can be blown into people's eyes and mouths, and it can also clog machinery.
* Dunes can also be a fire hazard, and they can also interfere with transportation.
Overall, the environmental impact of sand dunes is a complex issue that depends on a variety of factors. In general, sand dunes are more likely to have a positive impact on the environment than a negative one, but there are always exceptions to the rule.
