3.5 Ozone depletion
Page number 46&47
Ozone Layer Definition
“The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.”
What is Ozone Layer Depletion?
Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. One chlorine can destroy 100,000 molecules of ozone. It is destroyed more quickly than it is created.
Some compounds release chlorine and bromine on exposure to high ultraviolet light, which then contributes to ozone layer depletion. Such compounds are known as Ozone Depleting Substances (ODS).
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Ozone depletion contributes to global warming by allowing more UV radiation to reach Earth, which can affect weather and ecosystems. It also releases greenhouse gases like CFCs that warm the planet.
The Montreal Protocol, signed in 1987, is a global effort that has reduced ozone-depleting chemicals and helped protect the ozone layer.
If harmful emissions stop, the ozone layer could take 50 to 100 years to fully recover.
UV radiation, which is harmful to life, increases on Earth as the ozone layer thins, leading to health and environmental issues.
Ozone depletion is more severe at the poles, especially in Antarctica, while the equator sees more stable ozone levels.
Individuals and industries can help by using ozone-friendly products, supporting the Montreal Protocol, and avoiding chemicals like CFCs.