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Climate warming is not directly related to increasing number of cases of skin cancer:
Depletion of stratospheric ozone leads to an increase in UV exposure and temperature, increasing the risk of skin cancer and cataracts. Alternatively, an increase in exposure to UV radiation can lead to elevated levels of Vitamin D, which has been associated with a decreased risk of some types of cancer.
sourceBy the way, sunscreen do not protect from skin cancer, they protect skin from burning:During the period 1957-1984 the annual age-adjusted incidence rate of cutaneous malignant melanoma (CMM) increased by 350% for men and 440% for women in Norway. The annual exposure to carcinogenic sunlight in Norway, calculated by use of measured ozone levels, showed no increasing trend during the same period. Thus, ozone depletion is not a cause of the increasing trend of the incidence rates of skin cancers. The incidence rates of basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) increase with decreasing latitude in Norway. The same is true for CMM in Norway, Sweden, and Finland.
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In fact, a study in the Journal of Clinical Pharmacology and Therapeutics reports that:
On the top of that sunscreens contain cancerogenic materials.Sunscreens protect against sunburn, but there is no evidence that they protect against basal cell carcinoma or melanoma. Problems lie in the behavior of individuals who use sunscreens to stay out longer in the sun than they otherwise would. Vitamin D inhibition is, at this stage, unlikely due to insufficient use by individuals. Safety of sunscreens is a concern, and sunscreen companies have emotionally and inaccurately promoted the use of sunscreens.
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Sunscreen protects your skin from UV rays, but they are actually needed for vitamin D production. Right levels of vitamin D protects from sunburning AND skin cancer.
However, correct sunbathing and usage of skin care products is not enough. Diet also plays a huge role ( as with prevention of every other type of cancer).
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