Word: ultraviolet
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...idea that thinning ozone will let more solar ultraviolet radiation strike the earth (leading to increased skin cancers and cataracts as well as weakened immune systems) has been so far a mostly theoretical danger. Four years of careful measurements, however, now show a direct relationship between ozone loss and ultraviolet leakage...
...associated with working in the Tower for 20 years is equivalent to smoking one pack of cigarettes in an entire lifetime (lung cancer only), riding a motorcycle for 11 miles, spending time indoors over five months (radon exposure), or going on a two-week vacation in the Rocky Mountains (ultraviolet radiation...
They don't block out all the sun's ultraviolet rays...
...evidence gathered from animal experiments and epidemiological surveys points to the high-energy, shorter-wave ultraviolet-B portion of the sun's radiation as the main culprit in causing basal- and squamous-cell cancer. (Sunburns are also caused by UV-B radiation, wrinkles by the weaker UV-A part of the spectrum.) Since no animals other than humans and opossums suffer from malignant melanoma, researchers still do not know exactly what causes that more deadly disease. Most dermatologists have long assumed that sunburn-causing UV-B must be a greater threat than UV-A. As a result, sunscreen manufacturers originally...
...slowly fall, but ozone destruction will continue for several decades in the 21st century. Some optimistic scientists predict that the impact on the heavily populated middle latitudes will be tolerable: at worst, a 6% ozone loss during the summer months, which could cause a 12% increase in ultraviolet radiation. But these forecasts are based on the same computer models that have consistently underestimated the problem. Given the volatile and poorly understood chemistry of the upper atmosphere, no one can predict how severe the ozone depletion will be. Even a modest rise in the level of UV radiation could increase...