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).
Fall starts Tuesday, according to meteorologists. Meteorological fall (aka autumn) is defined as the months of September, October and November in the Northern Hemisphere (it's spring in the Southern Hemisphere). Most people consider the first day of autumn to be the autumnal equinox, which this year is September 23, according to WeatherBug meteorologist Mark Hoekzema. This is because, astronomically, the sun will be directly overhead of the equator as the Earth`s tilt begins to point the Northern Hemisphere away from the sun.