Despite these important steps, previously released CFCs continue to damage the ozone layer because they can remain in the atmosphere for more than 100 years. Ozone depletion is particularly bad over the Antarctic, seasonally producing an ozone hole, a large area of the atmosphere that contains extremely low amounts of ozone. Low levels of ozone have also been observed over the United States, Canada, Japan, Russia, and Europe. Scientists predict that the highest levels of CFCs in the atmosphere will occur during the first decade of the 21st century. If international agreements hold, the ozone layer is expected to recover around 2050.
Online Encyclopedia Blog For Kid's Research In Sciences, Health, Environment and Technology
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Pollution exists in many forms and affects many different aspects of Earth’s environment. Point-source pollution comes from specific, locali...
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Air Pollution, addition of harmful substances to the atmosphere resulting in damage to the environment, human health, and quality of life. O...
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Soil is a mixture of mineral, plant, and animal materials that forms during a long process that may take thousands of years. It is necessary...
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Water Pollution, contamination of streams, lakes, underground water, bays, or oceans by substances harmful to living things. Water is necess...
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Solid wastes are unwanted solid materials such as garbage, paper, plastics and other synthetic materials, metals, and wood. Billions of tons...