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Hardeners or cross-linking agents for polymers and epoxy resins. A, C, E. Chlorofluorocarbons (CFC) and other ozone-depleting substances. Källa: HFCs: A critical link in protecting climate and the ozone layer, UNEP . att fasa ut de kemikalier (CFC:er) som förstör ozonlagret, ett problem som delvis “Those who cling to an energy future based on coal, oil and gas will now fight all även en så kallas blåsgas. Förr i tiden användes CFC-gaser som isolergas i kylskåp, men har nu bytts ut med moderna Ozone depletion OD. of one unit of that gas relative to one unit of the reference gas, carbon dioxide, which is assigned a value of 1.
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These countries pledged to protect the ozone layer by phasing out production of ozone-depleting chlorofluorocarbons, which are also potent greenhouse gases. While the ozone layer is on a recovery path, scientists have found unexpectedly high emissions of CFC-11 and CFC-12, raising the possibility of production of the banned chemicals that could be 2021-03-15 · An ocean, oversaturated CFC-11 is a chlorofluorocarbon that was commonly used to make refrigerants and insulating foams. When emitted to the atmosphere, the chemical sets off a chain reaction that ultimately destroys ozone, the atmospheric layer that protects the Earth from harmful ultraviolet radiation. CFC stands for chlorofluorocarbons. This family of chemicals has seen widespread use in refrigeration and in aerosol cans. Their role in destroying the ozone layer has been known since the 1980s.
Gases such as CFC’s had damaged the ozone layer, creating a huge hole through which dangerous ultraviolet light could penetrate.
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But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. This website addresses stratospheric ozone issues, including the science of ozone depletion, EPA's regulatory approach to protecting the ozone layer, EPA-approved alternatives to ozone-depleting What is the ozone layer?
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ozone layer due to the emission of certain specific gases. The effect is expressed in gram equivalent of CFC-11. Photochemical Ozone Creation (POC). Svensk översättning av 'ozone-layer' - engelskt-svenskt lexikon med många fler HFC gases replaced CFC gases, which were destroying the ozone layer. Det är en färglös gas som används som kylmedel.
Unlike the CFCs, however, most HCFCs are broken down in the lowest part of the atmosphere and pose a much smaller risk to the ozone layer. Nevertheless, HCFCs are very potent greenhouse gases , despite their very low atmospheric concentrations, measured in parts per trillion (million million). For example, the two gases carbon tetrafluoride (CF 4, produced mainly as a by-product of the manufacture of aluminum) and CFC-11 (CCl 3 F, used in a variety of human activities) are both much
Ozone at High Risk From CFCs The ozone layer lies between about 9.3 and 18.6 miles (15 and 30 kilometers) above Earth's surface.
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This ozone layer filters out ultra-violet (UV) rays from the Sun and protects life on Earth. 2017-11-28 By the 1990s damage to the atmosphere was discovered by British Scientists in the Antarctic. Gases such as CFC’s had damaged the ozone layer, creating a huge hole through which dangerous ultraviolet light could penetrate. Where the hole in the ozone layer developed, these dangerous rays penetrated and reached the earths surface. The industrial production of CFCs started in the 1920’s, causing an average reduction of the ozone layer of 3 per cent. Fortunately, chlorine has “natural enemies” as well, such as methane (CH4). Thanks to them, the natural ozone layer could recover over 50 years, as long as CFCs are no longer used on a global level.
EF Link in Protecting Climate and the Ozone Layer, , 2011). for Liquid- or gas-filled and dry type transformers within the range of 16 kVA kg CFC-11 contributions to the breakdown of the ozone layer. (Ozone layer depletion potential) kg CFC-11 eq. + 3 Garnett T. (2007), The alcohol we drink and its contribution to the UK's greenhouse gas
av A Åkermarck · 2018 · Citerat av 1 — Kritisk punkt: tillstånd för ett ämne där man inte längre kan skilja på vätska och gas. GWP: Global Warming Potential.
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DALY. Disability Adjusted Life Year. EF Link in Protecting Climate and the Ozone Layer, , 2011). for Liquid- or gas-filled and dry type transformers within the range of 16 kVA kg CFC-11 contributions to the breakdown of the ozone layer. (Ozone layer depletion potential) kg CFC-11 eq. + 3 Garnett T. (2007), The alcohol we drink and its contribution to the UK's greenhouse gas av A Åkermarck · 2018 · Citerat av 1 — Kritisk punkt: tillstånd för ett ämne där man inte längre kan skilja på vätska och gas. GWP: Global Warming Potential.
Chlorofluorocarbons or CFCs ( also
chlorofluorocarbons (CFCs) are recognised to be ozone-depleting substances ( ODS), i.e. substances that do not have a global warming effect but influence the
22 Oct 2015 Hydrofluorocarbons (HFCs) are anthropogenic compounds that serve as replacements for both chlorofluorocarbons (CFCs) and
9 Mar 2014 The fourth gas is a hydrochlorofluorocarbon, or HCFC, a compound that replaced CFCs because it is less harmful to the ozone layer. 2 Jun 2007 Studies conducted in the 1970s found that CFCs when released into the atmosphere ( a common occurrence in cars, and refrigerant equipment),
3 Jun 2020 These include chlorofluorocarbons (CFCs), which were commonly found in air conditioners, refrigerators and spray cans; halons, which are found
18 May 2015 Some of the chemicals that replaced ozone-harming CFCs are long-lived greenhouse gases. At NOAA's lab in Boulder, Colorado, chemist
17 May 2018 Trichlorofluoromethane, or CFC-11, hurts the ozone layer and was phased out of production by 2010.
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cfc gases - Swedish translation – Linguee
Chemicals called chlorofluorocarbons (CFCs) are a reason we have a thinning ozone layer.