Ozone depletionOzone depletion describes two distinct, but related observations: a slow, steady decline of about 4 percent per decade in the total amount of ozone in Earth's stratosphere since the late 1970s; and a much larger, but seasonal, decrease in stratospheric ozone over Earth's polar regions during the same period. The latter phenomenon is commonly referred to as the ozone hole. In addition to this well-known stratospheric ozone depletion, there are also tropospheric ozone depletion events, which occur near the surface in polar regions during spring. The detailed mechanism by which the polar ozone holes form is different from that for the mid-latitude thinning, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. The main source of these halogen atoms in the stratosphere is photodissociation of chlorofluorocarbon (CFC) compounds, commonly called freons, and of bromofluorocarbon compounds known as halons. These compounds are transported into the stratosphere after being emitted at the surface. Both ozone depletion mechanisms strengthened as emissions of CFCs and halons increased. Wiki Ozone depletiontakes effort for Tree to be Hugging better than Ozone depletion today. Tree Ozone depletionhugging Jennifer Lopez donate computers donate computers They will sell to a company that specializes in store liquidation instead of attempting to run a store closure sale themselves. tree Jennifer Love Hewitt easy street liquidation easy street liquidation A liquidator is the officer appointed when a company goes into winding-up or liquidation who has responsibility for collecting in all of the assets of the company and settling all claims against the company before putting the company into dissolution. bit Jenny Mccarthy lets go recycle lets go recycle In most jurisdictions, a liquidator's powers are defined by statute. computer donation |
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