Final answer:
The incidence of skin cancer has increased fourfold in the last 30 years due to factors such as UV exposure and lifestyle habits.
Step-by-step explanation:
The incidence of skin cancer has indeed increased over the past 30 years. Exposure to UV light, particularly from the sun, is a major factor contributing to the development of skin cancer. Prolonged or excessive exposure to UV radiation damages the DNA in skin cells, causing them to grow uncontrollably and form tumors.
According to studies, the rate of skin cancer has increased fourfold in some regions over the last few decades. This is due to various factors, including depletion of the ozone layer, increased sun exposure, and changes in lifestyle habits such as increased outdoor activities and tanning bed use.