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Twenty Questions
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51	TWENTY QUESTIONS: 2006 UPDATE V. IMPLICATIONS OF OZONE DEPLETION Q17: Does depletion of the ozone layer increase ground-level ultraviolet radiation? Yes, ultraviolet radiation at Earth’s surface increases as the amoun Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:51:27 Radiation Sun tanning Ultraviolet radiation Oxygen Prevention Ultraviolet index Ozone layer Sunburn Ultraviolet Electromagnetic radiation Environment Ozone depletion
52	TWENTY QUESTIONS: 2006 UPDATE I. OZONE IN OUR ATMOSPHERE Q1: What is ozone and where is it in the atmosphere? Ozone is a gas that is naturally present in our atmosphere. Each ozone molecule contains three atoms of oxyge Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:40:29 Ozone depletion Environment Atmosphere Oxidizing agents Planetary atmospheres Ozone layer Ozone Stratosphere Atmosphere of Earth Chemistry Oxygen Earth
53	TWENTY QUESTIONS Q16: Has the Montreal Protocol been successful in reducing ozone-depleting gases in the atmosphere? Yes, as a result of the Montreal Protocol, the total abundance of ozone-depleting gases in the atmosph Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:22:12 Refrigerants Ozone depletion Halogenated solvents Chlorofluorocarbon Montreal Protocol Ozone layer Bromotrifluoromethane Chlorine 1 1 2-Trichloro-1 2 2-trifluoroethane Chemistry Halomethanes Greenhouse gases
54	TWENTY QUESTIONS: 2006 UPDATE Q18: Is depletion of the ozone layer the principal cause of climate change? No, ozone depletion itself is not the principal cause of climate change. However, because ozone absorbs solar rad Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:51:56 Ozone depletion Millennium Development Goals Oxygen Climate forcing Montreal Protocol Ozone Greenhouse gas Radiative forcing Chlorofluorocarbon Environment Atmospheric sciences Earth
55	TWENTY QUESTIONS VI. STRATOSPHERIC OZONE IN THE FUTURE Q19: How will recovery of the ozone layer be detected? Scientists expect to detect the recovery of the ozone layer with careful comparisons of the latest ozone meas Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:22:24 Earth Chemistry Environmental chemistry Ozone layer Ozone Scientific Assessment of Ozone Depletion Montreal Protocol Ozone depletion Environment Oxygen
56	TWENTY QUESTIONS: 2006 UPDATE IV. CONTROLLING OZONE-DEPLETING GASES Q15: Are there regulations on the production of ozone-depleting gases? Yes, the production of ozone-depleting gases is regulated under a 1987 internati Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:50:31 Halogenated solvents Oxygen Refrigerants Heating ventilating and air conditioning Montreal Protocol Chlorofluorocarbon Ozone layer Ozone Fluorine Chemistry Environment Ozone depletion
57	TWENTY QUESTIONS: 2006 UPDATE Q20: When is the ozone layer expected to recover? Substantial recovery of the ozone layer is expected near the middle of the 21st century, assuming global compliance with the Montreal Proto Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:52:47 Atmospheric sciences Atmosphere Oxygen Ozone layer Ozone Montreal Protocol Chlorofluorocarbon Stratosphere Polar stratospheric cloud Ozone depletion Environment Earth
58	TWENTY QUESTIONS: 2006 UPDATE Q8: What are the reactive halogen gases that destroy stratospheric ozone? Emissions from human activities and natural processes include large sources of chlorine- and bromine-containing gas Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:46:02 Earth Atmosphere Oxidizing agents Oxygen Environmental chemistry Ozone layer Ozone Chlorine monoxide Chlorine Chemistry Ozone depletion Environment
59	TWENTY QUESTIONS: 2006 UPDATE Q9: What are the chlorine and bromine reactions that destroy stratospheric ozone? Reactive gases containing chlorine and bromine destroy stratospheric ozone in “catalytic” cycles made u Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:46:27 Oxidizing agents Oxygen Chemical elements Atmosphere Ozone Chlorine monoxide Stratosphere Chlorine Polar stratospheric cloud Chemistry Matter Ozone depletion
60	TWENTY QUESTIONS II. THE OZONE DEPLETION PROCESS Q6: What are the principal steps in stratospheric ozone depletion caused by human activities? The initial step in the depletion of stratospheric ozone by human activities Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:21:25 Earth Atmosphere Oxidizing agents Oxygen Environmental chemistry Ozone layer Ozone Atmosphere of Earth Stratosphere Chemistry Environment Ozone depletion

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