In 1928, chlorofluorocarbons were first created as nontoxi nonflammable refriger
ID: 295613 • Letter: I
Question
In 1928, chlorofluorocarbons were first created as nontoxi nonflammable refrigerants. More popularly known as CFCs, these odorless chemicals were soon produced commercially. Inexpensive to manufacture, CFCs could be found almost everywhere: as propellants in aerosol spray cans, cleaners for computer chips, and coolants in air conditioners. In 1974, however, chemists Sherwood Rowland and Mario Molina demonstrated that CFCs destroyed protective ozone in the atmosphere.1 These sentences explain how research in the of CFCs in the past. Initial research on CFCs led to a wide variety of uses for this chemical. However, continued research eventually revealed that CFCs were very affected the use harmful to the environment. Ozone keeps about 95% of the sun's harmful ultraviolet radiation from reaching the earth's surface; depletion of ozone from use of CFCs creates a plethora of human health issues, such as increased rates of skin cancer, and environmental issues, such as increased levels of acid deposition As countries around the world realized the hazards of CFCs, many knew something had to be done to reverse the effects of ozone depletion.2 In 1987, representatives of 36 nations met in Montreal, Quebec, Canada, and developed the Montreal Protocol, which cut emissions of CFCs by about 35%. Several revisions were soon made to the Montreal Protocol, based on continued research documenting the effects of CFCs on the ozone layer.3 These landmark agreements, now signed by 195 countries, have effectively phased out the production and use of CFCs on a global scale This sentence highlights concerns reflecting the perspective of the 3This sentence describes how research in the decisions made in the helped guide the social sciences natural sciences humanities (To clear all highlightiExplanation / Answer
1.propellants in aerosol spray,cleaner for computer chip and coolant in air-conditioner.
2. Ozone depletion and it's harmful effects on human body.
3.documenting the effects of CFC.
Natural sciences