What are the different types of UV light and how do they differ in terms of their effects on human health and the environment?

There are three main types of UV light: UVA, UVB, and UVC. UVA and UVB are the most common types that reach the Earth's surface, with UVA being less harmful than UVB. UVB is responsible for sunburns and skin cancer, while UVA can cause skin aging and eye damage. UVC is the most harmful type but is mostly absorbed by the Earth's atmosphere and does not reach the surface. Overall, UV light can have negative effects on human health, such as skin damage and eye problems, and can also harm the environment by damaging ecosystems and contributing to climate change.