These then react with the ozone molecules, resulting in their removal. CFCs have a lifetime in the atmosphere of about 20 to 100 years, and consequently one free chlorine atom from a CFC molecule can do a lot of damage, destroying ozone molecules for a long time.
exists and is an alternate of . In the northern hemisphere of Earth, Fall begins on the Autumnal equinox (22-23 September) (in Persian calender it will begin at the first day of Mehr) and ends on the Winter solstice (21-22 December). In the southern hemisphere of Earth, Fall begins on the Autumnal equinox (20-21 March) and ends on the Winter solstice (20-21 June).
Report Abuse. 1  Mr Weather's quite thorough but only half correct - only for the northern hemisphere. 2  This Site Might Help You. 3  When Does Summer End.  Spring Starts-March 1  21st. What Day Does Fall Start.  winter begins officially dec. 21 and then go 3 months after for each of the rest of the seasons...march 21, etc. iprfm Â· 9 years ago.