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'What are: ozone depletion potentials (ODP) and how have they helped in understanding the current global situation on atmospheric ozone?'

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6. (i) 'What are: ozone depletion potentials (ODP) and how have they helped in understanding the current global situation on atmospheric ozone?' It is generally accepted by the scientific community that chlorofluorocarbons and halons are contributing the most severe threat to the ozone layer, as they can breakdown Ozone (O3) (Reiss et al,2000). This puts the global populous at risk from increasing chances of skin cancer, suppression of the immune system & a decline in crop productivity - resulting from the fall in O3 and the subsequent rise in Ultraviolet (UV) radiation reaching earths surface. Ozone Depletion Potential (ODP) has been formulated to help us gauge the effect of synthetic chemicals on depleting stratospheric ozone (Parker,1996). ...read more.


So far the "steady-state" ODP (Parker,1996) has been focused upon as it most clearly represents the effects of long-term ozone depleting substances that survive as long as or longer than CFC-11 (50 years). But more short lived substances may still have a high impact on ozone which is not reflected in this "steady-state" ODP but the "time-dependant" ODP portraits ozone loss over a set timescale e.g. 12 months and thus is more representative of the short lived substances. Appendix one shows that the Clean Air Act (CAA) (EPA,2004) has used ODP to rank many ODS's e.g. methyl bromine into 8 classes. Thanks to the use of ODPs, alternatives like hydrochlorofluorocarbons (HCFCs) ...read more.


and solar cycles among other things impact upon the ozone layer. Word count: 509 Ennis, C (2000), Scientific assessment panel, UNEP, http://www.unep.org/ozone/scientific-assessment2000.shtml Pool, R. (1989), The elusive replacements for CFCs, Ciesin, http://www.ciesin.org/docs/011-490/011-490.html Person, R (1997), Ozone depletion FAQ Part I: Introduction of the Ozone Layer, http://www.faqs.org/faqs/ozone-depletion/intro/ Gumprecht, W (2003), Refrigerants for the 21st century - Identifying Alternatives, http://chemcases.com/fluoro/fluoro11.htm Lea, C (2005) After CFCs?, http://www.elchempub.com/epfiles/ep24.htm#Description Parker, L (1996) Stratospheric Ozone depletion: Implementation Issues, http://www.fas.org/spp/civil/crs/97-003.htm Diffey, B (2003) Climate change, ozone depletion and the impact on ultraviolet exposure of human skin, Physics in Medicine and Biology, http://ej.iop.org/links/q69/cELpvERtlhiHf0MFuXV8lw/pmb4_1_r01.pdf United states Environmental protection Agency (2004) Class I ozone depleting substances, http://www.epa.gov/ozone/ods.html Buchdahl, J (2002) Ozone depletion, Atmosphere, climate & Environment Information Programme, http://www.ace.mmu.ac.uk/Resources/Fact_Sheets/Key_Stage_4/Ozone_Depletion/pdf/Ozone_Depletion.pdf Reiss, M & Chapman, J (2000) Environmental Biology, Cambridge press, Cambridge. ...read more.

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