why do CFC's threten the ozone layer?
139411
Because, when used, the CFC is broken apart by ultraviolet radiation releasing a free chlorine atom. This atom will enter the ozone layer and "steel" an oxygen atom from an ozone(O3) molecule. The O2 left over enters the atmosphere as normal oxygen gas. The chlorine atom from the Cl-O molecule then separates to go break up other ozone molecules.\nThis may seem like no big deal, but if many CFCs are released and left in the ozone for a long time, many ozone molecules are destroyed.  The CFCs remain in the atmosphere for many many years.
532115
ozone is one of the gases in our atmosphere.\n\nit protects us from some of the more poisonous rays of the sun - radiation that is very harmful to life on earth.\n\nOzone is exactly half of Oxygen, meaning oxygen always has two atoms stuck together, ozone only has one.\n\nIf the ozone layer goes, we will all die of cancer faster than you can imagine, among other gross diseases and starvation (coz food won't grow with all that poisonous radiation).\n\nIn australia, more ppl get skin cancer than anywhere else, because there is a huge hole in the ozone layer right on top of australia.\n\nDo you know that smell that comes when lightning strikes right before a delicious thunderstorm?? There is this yummy smell in the air - that's ozone you're smelling. The lightning (electricity basically) splits the oxygen molecules in the air - this is ozone.
569862
the depletion of the ozone layer
168302
Because they deplete the ozone layer.
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Q: What common product, used widely in homes and cars, was banned due to its impact upon the ozone layer?\n\nA: Freon
1141352
It is a myth thought up by the tree huggers to get money from the federal government of the USA to do studies. they had to have a reason for the grants. Over all, although it seems warmer the earth has actually warmed only about 1 degree. It is warmer in cities because of the concrete and asphalt.\n\nThey have tried to blame the depletion on fluorocarbons, but that is a out  and out lie because Mt. Pinatubo (hope that is spelled close) has put out more fluorocarbons than all the air conditioners, aerosol cans and refrigerators have combined since before WWII.\n\nAlso H.A.A.R.P. is to blame for the changes in weather. If you don't know what that is...look it up and find out.\n\nReading some of the answers given no wonder the bad guys are winning...quit believing the garbage put out by the news media and learn for yourselves. I keep giving information and sites and yet you don't look at them or try to learn...no wonder this world is going the way it is...too many young people just parrot what they hear and never check out for themselves...get with it kids because you are fast loosing your country and world! Now read below!
146462
Chloroflourocarbons (CFC's) were banned because it was discovered they were a large contributer to the depletion of the Earth's ozone layer.
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CFC's are the the chemicals that cause the green house effect. when you consider how many people in the world that use hair spray and airfresheners... thats alot of pollution
1064034
Choloroflourocarbons, otherwise known as CFC's.  CFC's were primary ingredients in cooling systems of refrigerators, freezerd, and air conditioners.  They also found their way as propellants in spray cans and foam insulation and cushions.  Thomas Midgely, working I believe for DuPont invented them as an alternative to some corrosive, dangerous gases being used in fridges in early days. CFC's react with ozone in the stratosphere and break it down to ordinary oxygen.
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Well it has to do w/ the fact that it forms up in the stratosphere.\n\nHigh levels of short wave radiation break apart oxygen molecules (O2) into 2 oxygen atoms. Since oxygen isn't stable alone, it will recombine. Sometimes it recombines w/ two other oxygen atoms to form O3 (ozone).\n\nOzone can form in the troposphere by exposing fossil fuels to solar radiation. You know, like pumping gas on a hot summer afternoon. Surface ozone is dangerous. Ozone is toxic to humans. Much less gets formed down here b/c we are much more protected from the high levels of short wave solar radiation.
492421
it is O3 and it protect the air from ultraviolet rays from the sun \nit is the outermost layer in the atmosphere \n \nor go on www.dictionary.com
506524
The vast majority of air conditioning systems do not purify air.  There are a few that do however.  Some air conditioning units are equipped with HEPA filters.  These filters filter out quite a lot of small particles.  Some use activated-charcoal which is able to chemically react with many potential toxins in the air.  Others use UV light inside the air conditioning unit in order to break down particles of pollen, viral particles, bacteria, and fungi.  I am unaware of any that can remove CO2, but there are some that can probably remove CO.  Some do unfortunately produce ozone.\n\nThe units that use UV light can produce ozone, and sometimes can even blacken walls where they pump out air.  Some filters use charged plates to capture charged particles in the air.  These charged plates can also cause the formation of Ozone.
213682
The main problem with mars is not thelack of air, but the local gravity's inability to hold much air on the planet- as such you need a heavy gas to be able to be held by the gravity longer. One idea would be to send rockets full of old cfc containers on a collision course to mars, the release of the cfc's would cause a partial runaway greenhouse effect thht would begin to warm the planet over decades.\nAlso, ice comets can be used on aerobraking orbitals to slowly melt in the atmosphere, thus watering the planet and warming the air by the aerobraking.\nThe temperature differentials are due to the very thin atmosphere and would become less extreme with a thicker blanket of air.\nAnother option would be to genetically modify algae and lichen to live in the high UV and co2 rich atmosphere and crack the co2 into oxygen, while leaving the carbon as a slurry-type layer that can be refined for use in building materials\nThere is lots of potential - all that really remains is to define the technology level and then go for it -  imagination is a wonderful thing - we need to use more of it
866727
Atmospheric carbon dioxide.
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C\n\n\nOzone layer is responsible to inhibit UV radiation from Sun to reach earth. Once Ozone layer vanishes, UV radiations are free to reach earth which may cause skin cancer and other diseases.
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PLEASE PLEASE PLEASE!  Once again, CFCs have no effect on global warming.  Please get this muddle corrected.\n\nAs for your question:  The best guess is that one third is "natural" and two thirds are human caused
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The Recipe For Ozone Loss\n\nTo summarise then, we have looked at the 'ingredients' or conditions necessary for the destruction of ozone that we see in Antarctica. The same applies more or less to the loss of ozone in the Arctic stratosphere during winter. Although in this case the loss is not nearly so severe.\n\nTo recap then, the requirements for ozone loss are:\n\nThe polar winter leads to the formation of the polar vortex which isolates the air within it.\n\nCold temperatures form inside the vortex; cold enough for the formation of Polar Stratospheric Clouds (PSCs). As the vortex air is isolated, the cold temperatures and the PSCs persist.\n\nOnce the PSCs form, heterogeneous reactions take place and convert the inactive chlorine and bromine reservoirs to more active forms of chlorine and bromine.\n\nNo ozone loss occurs until sunlight returns to the air inside the polar vortex and allows the production of active chlorine and initiates the catalytic ozone destruction cycles. Ozone loss is rapid. The ozone hole currently covers a geographic region a little bigger than Antarctica and extends nearly 10km in altitude in the lower stratosphere.