Ozone layer depletion has stopped
Great news - the UN scientists announced that the ozone layer depletion has stopped.
Ozone provides a natural protective filter against harmful ultra-violet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation.
This is partly credited to the efforts by many countries in the signing of the Montreal treaty in 1987 to reduce the use of CFCs, substances used in refrigerators, aerosol sprays and some packing foams which has caused the destruction of the ozone layer.
However, the ozone-friendly substances that have replaced CFCs in plastics or as refrigerants, which are hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs), are also powerful greenhouse gases. HFCs alone are regarded as 14,000 times more powerful than carbon dioxide (CO2) and HFC emissions are growing by eight percent a year, according to UN agencies. This will pose a challenge in dealing with the global climate change problem.
Adapted from http://www.google.com/hostednews/afp/article/ALeqM5go2RnKHmYcJjFtzH-vKYV2gs_yJA
Ozone provides a natural protective filter against harmful ultra-violet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation.
This is partly credited to the efforts by many countries in the signing of the Montreal treaty in 1987 to reduce the use of CFCs, substances used in refrigerators, aerosol sprays and some packing foams which has caused the destruction of the ozone layer.
However, the ozone-friendly substances that have replaced CFCs in plastics or as refrigerants, which are hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs), are also powerful greenhouse gases. HFCs alone are regarded as 14,000 times more powerful than carbon dioxide (CO2) and HFC emissions are growing by eight percent a year, according to UN agencies. This will pose a challenge in dealing with the global climate change problem.
Adapted from http://www.google.com/hostednews/afp/article/ALeqM5go2RnKHmYcJjFtzH-vKYV2gs_yJA
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