1. The hole was first discovered in 1956, before CFC's came into existence.
The scientist who first discovered the "hole" was Dr. Gordon Dobson, he concluded that it was a natural phenomenon that appeared annually near the end of winter, and the hole vanished suddenly with the onset of spring
2. The "hole" is not a hole.
The ozone "hole" is actually a thinning of the ozone in the ayer. The lowest ozone concentration ever recorded in the "hole" was 30% of the normal level.
3. Worldwide ozone layers are actually increasing.
Average ozone levels are higher right now than they were in 1962, even though CFC use reached a maximum in 1974.
4. The worst-case ozone depletion scenarios of the environmentalists due to changes in the weather, solar activity, and latitude.
The (global disaster" that the environmentalist predicted was a decrease in average ozone levels by less then 10% in the next 100 years
The ozone layer is disappearing due to various man made and natural reasons. Major of them being usage of Ozone depleting substances by humans. They contain chlorine which destroys ozone molecules in the ozone layer.
See "What is causing the depletion of the ozone layer?" in the "Related questions" section below.
Scientists believe the ozone layer is disappearing for many reasons. Release of synthetic chemicals called CFC's is one.
The don't "think" the ozone level is being affected, they measure it with systems such as absorbtion spectrographs and measure its change.
Ozone layer is depleting because of CFC gases. It has made holes in Ozone layer.
CFC's are causing damage to ozone layer. They react with ozone to deplete it.
See "What is causing the depletion of the ozone layer?"
The ozone present in the stratospheric region of atmosphere filters our cancer causing rays from the sun. This ozone is present in the form of ozone layer.
See "What is causing the depletion of the ozone layer?"
no
CFC's are causing loss of ozone layer. They react with ozone to deplete it.
CFC's are causing damage to ozone layer. They react with ozone to deplete it.
See "What is causing the depletion of the ozone layer?"
See "What is causing the depletion of the ozone layer?"
See "What is causing the depletion of the ozone layer?"
See "What is causing the depletion of the ozone layer?"
See "What is causing the depletion of the ozone layer?"
CFC's are causing its thinning. They react with ozone to deplete it.
The ozone present in the stratospheric region of atmosphere filters our cancer causing rays from the sun. This ozone is present in the form of ozone layer.
CFC's cause ozone destruction. They react with ozone to deplete it.
See "What is causing the depletion of the ozone layer?"
See "What is causing the depletion of the ozone layer?"