Human activity influences a wide range of components that affect the surface UV radiation levels. among them ozone at high latitudes. We calculate the effect of human-induced changes in the surface erythemally weighted ultra-violet radiation (UV-E) since 1750. We compare results from a radiative transfer model to surface UV-E radiation for year 2000 derived by satellite observations (... https://countryscenesaddleryandpetsuppliers.shop/product-category/herman-oak-browband-work-bridle/