We humans have good reason to praise the sun, since life on Earth would be impossible without it. Unfortunately, there is such a thing as too much sun due to the harmful effects of over exposure to the sun’s ultraviolet radiation. In fact, ultraviolet radiation (UV) is officially categorized by the World Health Organization and the U.S. Department of Health and Human Services as a human carcinogen.
Risk of Skin Cancer
At some point in their life, one out of every five Americans will develop skin cancer. While genetic and immune system disorders are sometimes responsible, the major cause of skin cancer is overexposure to UV radiation from the sun. The most dangerous form of skin cancer is melanoma, which is responsible for three out of four deaths from skin cancer. People who had serious sunburns as children are especially susceptible to developing melanoma later in life.