Today many different cfc's are produced and worldwide consumption in 1988 was estimated at over billion kilograms in 1974 mjmolina and fsrowland published a laboratory study demonstrating the ability of cfc's to catalytically breakdown ozone in the presence of high frequency uv light further studies estimated that the ozone layer would be depleted by cfc's by about 7% within 60yrs and based on such studies the us banned cfc's in aerosol sprays in 1978.
Ozone depletion would magnify all of the effects of uv on human health, both positive (including production of vitamin d) and negative (including sunburn, skin cancer, and cataracts) in addition, increased surface uv leads to increased tropospheric ozone, which is a health risk to humans.
A history of controlled foreign corporations and the foreign tax credit 2 andersen, richard e (1996), foreign tax credits , warren, gorham & lamont, boston, ma 3 dividends from a disc or former disc refer to dividends from a domestic international sales corporation (disc) that are treated as foreign-source income.
Interpreting information - verify that you can read information regarding research into cfc's and what it led to knowledge application - use your knowledge to answer questions about the common uses of cfcs additional learning to learn more review the corresponding lesson call cfcs: definition, properties & uses.
Up through the 1970's, the combined federal campaign (cfc) was a relatively non-controversial program in terms of the charities allowed to participate growth in the number of participating national charities was slow -- from 23 in 1969 to only 33 in 1979.
Three cfc alternatives: hfcs, pfcs and sf6, influence global warming in 1985, the observation of an ozone hole in the antarctic pole provided proof that the ozone layer was depleting hfcs, pfcs and sf6 are not ozone depleting substances, however, compared to co2, they have a greater influence on global warming.
The alliance for responsible cfc policy was formed to lobby government against regulation and block any restriction on their use however, in 1985, the british antarctic survey claimed they had spotted a ‘hole’ in the ozone layer, confirming rowland’s prediction. Bible study competing priorities that is one of the greatest challenges in our daily life between work, family, and other obligations, people often have to choose a narrower focus of activities than they may desire in order to avoid neglecting the most important areas of their lives.