Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Ozone and Ozone depleting substances OSD's

  • 04-02-2002 4:37am
    #1
    Typedef
    Closed Accounts Posts: 5,564 ✭✭✭


    The threat that depletion of the earth's ozone layer poses has not gone away. Here are some extremely worrying facts. Some of the most destructive agesnts to ozone CFC-12, CFC-113, HCFC-123 and N²0 can exist at altitudes of 20 kilometers for around 100 years. CFC-114 has a life of about 10,000 years at 20km (info). Even more worrrying is the fact that CFC's can take up to twenty years to reach such altitudes. Therefore even after the total phase out of CFCs globally it will be twenty years before the entire impact of the CFC already released will be truly felt.

    When CFCs are bombarded by ultraviolet radiation as is the case int the upper earth's atmosphere, they break down into chlorine, halons [Halon: a compound consisting of bromine, fluorine, and carbon
    ] break down into amongst things bromine, it is the chlorine and bromine which are responsible for destroying the ozone.
    http://www.epa.gov/docs/ozone/science/process.html

    The mainstay of the hole in the ozone layer is over the continent of Antartica, and most of the destruction comes in the Antartic spring. The hole in the Ozone layer has grown so much that it now can encompass the tip of South America. This exposes the humans living in South America to very high levels of Ultra Violet Radiation, higher levels than humans evolved to tolerate and has an extremely adverse affect on sight and levels of skins cancer in the Region.

    The main problem is that even if all CFC production and consumption were stopped globally, the extremely stable CFC molecules with such long lives would be filtering into the stratosphere for the next twenty years and would be 'hanging around' for the next 150 years give or take. Make no mistake, the hole in the ozone layer is the biggest ecological disaster ever caused by humans.


Advertisement