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).
By NINA RUGGIERO September 22, 2014. In many of our hearts and minds, the start to fall is not scientific. It's the moment the air gets cooler, the moment we slip on our first sweater, the moment we order our first pumpkin spice latte. But fall does not begin in the Northern Hemisphere, officially, until the minute the autumnal equinox strikes.