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| Titel |
Growth of climate change commitments from HFC banks and emissions |
| VerfasserIn |
G. J. M. Velders, S. Solomon, J. S. Daniel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 9 ; Nr. 14, no. 9 (2014-05-12), S.4563-4572 |
| Datensatznummer |
250118689
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| Publikation (Nr.) |
 copernicus.org/acp-14-4563-2014.pdf |
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| Zusammenfassung |
| Chlorofluorocarbons (CFCs) are the primary cause of ozone depletion, and
they also contribute to global climate change. With the global phaseout of
CFCs and the coming phaseout of hydrochlorofluorocarbons (HCFCs), the
substitute hydrofluorocarbons (HFCs) are increasingly used. While CFCs were
originally used mainly in applications such as spray cans and were released
within a year after production, concern about the ozone layer led to
reductions in rapid-release applications, and the relative importance of
slower-release applications grew. HFCs are now mainly used in refrigerators
and air conditioners (AC) and are released over years to a decade after
production. Their containment in such equipment represents banks, which are
building up as production grows. A key finding of our work is that the
increases of HFC banks represent a substantial unseen commitment to further
radiative forcing of climate change also after production of the chemicals
ceases. We show that earlier phaseouts of HFCs would provide greater
benefits for climate protection than previously recognized, due to the
avoided buildup of the banks. If, for example, HFC production were to be
phased out in 2020 instead of 2050, not only could about 91–146 GtCO2-eq
of cumulative emission be avoided from 2020 to 2050, but an
additional bank of about 39–64 GtCO2-eq could also be avoided in
2050. Choices of later phaseout dates lead to larger commitments to climate
change unless growing banks of HFCs from millions of dispersed locations are
collected and destroyed. |
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