High levels of radiation is one way that can negatively impact humans and add environmental stresses to their survival. Humans who are exposed to these levels of solar radiation may experience damage including sunburn, photo aging, or even skin cancer. This can interrupt the processes of homeostasis because it can actually break down certain cells too quickly and damage healthy tissue if proper protection like sunscreen is not being used while being exposed to high levels of solar radiation. While some UV's are actually healthy for the skin, others can be extremely harmful. A short term cause for high exposure to high solar radiation may include sunburn. While this may seem temporary, it actually causes the skin to turn red and eventually thicken and dry out which then creates a thickening of the skin. As for facultative stresses, different pigmentation in the skin may occur dependent on the genes or stress. Pigmentation may darken through moving from a population with low exposu...