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 Solar Power to be Pool better than Ozone depletion today. Solar Power Ozone depletionBridget Hall sell used Cisco sell used Cisco In October 2001, the United States Environmental Protection Agency created rules stating that CRTs must be brought to special recycling places. Bridget Moynahan solar power pool solar power pool In some jurisdictions, discarded CRTs are regarded as toxic waste. Britney Spears think b4 act think b4 act The glass envelopes of modern CRTs may be made from heavily leaded glass, which represent an environmental hazard. Brittany Snow tree hugging tree hugging Computer monitors may contain toxic phosphors within the glass envelope. Brook Burns tree hugging tree hugging As compared to a traditional desktop PC configuration, such a configuration would probably reduce IT maintenance-related activities, extend the useful life of the hardware, and allow for responsible recycling of the equipment past its useful life. Brooke Burke wt bit wt bit For example, an IT manager might purchase Electronic Products Environmental Assessment Tool (EPEAT)-approved hardware combined with a thin client solution. Brooke Shields iPod home iPod home best better |
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