What has caused the ozone loss over the past 50 years?

Answer 1

Ozone levels have been decreasing because of ozone depleting chemicals like chlorofluorocarbons (CFCs).

Thanks to worldwide agreement and compliance with the 1987 UN Montreal Protocol (which agreed to phase out ozone depleting chemicals) global ozone depletion is no longer increasing. The Montreal Protocol is the most (some would say only) successful international agreement and scientists hope the ozone layer will have completely recovered by 2060.

Answer 2

There are two different types of ozone depletion, both are very similar. The first one has been a slow, but steady ozone depletion of 4% per decade of the Earth's stratosphere(ozone layer). This has been happening constantly since the 1970's. The other is a much larger, although seasonal loss of ozone over the polar regions. This yearly occurrence is called the ozone hole. There are many causes for ozone depletion, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. Both come from the breaking down of chloroflourocarbons(freons) by photons in the atmosphere.

Chloroflourocarbons(CFC) are the "big dog" as far as causes of ozone depletion are concerned. are man There are two different types of ozone depletion, both are very similar. The first one has been a slow, but steady ozone depletion of 4% per decade of the Earth's stratosphere(ozone layer). This has been happening constantly since the 1970's. The other is a much larger, although seasonal loss of ozone over the polar regions. This yearly occurrence is called the ozone hole. There are many causes for ozone depletion, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. Both come from the breaking down of chloroflourocarbons(freons) by photons in the atmosphere.

Answer 3

The main cause of ozone loss over the past 50 years is the release of man-made chemicals called chlorofluorocarbons (CFCs) and halons. These chemicals break down ozone molecules in the stratosphere, leading to the formation of the ozone hole. International agreements like the Montreal Protocol have helped reduce the production and use of these ozone-depleting substances.

Answer 4

The loss of ozone in the last 50 years has been caused due to the use of ozone depleting substances by humans. These ODS react with ozone to deplete it.

Answer 5

Greenhouse gases and CFC's are the main source. They have been main reasons for ozone destruction.

Answer 6

The CFC's have caused it. They react with ozone and deplete it.

Answer 7

The problem of ozone layer is the ozone hole. The ozone hole is the lowering of concentration of ozone layer.