True or False. Depletion of stratospheric ozone is a major (direct) cause of glo

Question

True or False. Depletion of stratospheric ozone is a major (direct) cause of global                                                                        warming.

           Explain why stratospheric ozone is essential for life (as we know it) on Earth.

            What was the international agreement that established policy for protecting the                 stratospheric ozone layer?               In what decade was this agreement made?

            True or False. Colder temperatures in the stratosphere cause greater                                                                                                      depletion of ozone by CFCs.        

            True or False. Warming of the troposphere due to an increase in greenhouse                                                      gases can cause cooling of the stratosphere.

Explanation / Answer

Answer. False. Ozone hole is not responsible for global warming. Increased CO2 content is responsible for it. The burning of fossil fuels, deforestation are the major causes for it.

Answer. Ozone layer is protecting the Ultra voilet rays in reaching the earth's surface. These UV rays are harmful to the human beings because they have great penetration power, and has the capability to mutate the DNA, by forming thymine dimers, and causing skin cancer. Use of Ozone depleting substances like cholorofluorocarbons deplete ozone layer causing ozone hole. Through this hole UV rays can come to earth's surface and increase the probability of skin cancer.

Answer. As first ozone hole was noticed near Antarctica, international union was done to save the stratosphere ozone layer. MONTREAL PROTOCOL was the result of such international union. It was given in the year 1987. Thus, the decade is 1980-1990. This protocol discouraged the use of Ozone Depleting Substances or ODSs. Since 1987, almost 8 revisions are done in this protocol this now.

Answer. True, colder temperature in the stratosphere causes more damage to ozone. As it was observed that the first hole near the Antarctica and the recovery of it is still quite less.

Answer. True, warming of troposphere does causes cooling of the stratosphere. It is done through the conversion of translational kinetic energy into the infrared radiation and through the absorption of IR by CO2 of the troposphere and not available to the stratosphere.

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