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 Why Go Green to be Plant Trees Today better than Ozone depletion today. Why Go Green Ozone depletion |
Why Go Green At www.why-go-green.com we ask Why not go green today? |
cloud forest cloud forest computer recycling computer recycling Environmental movement Environmental movement Environmentalism Environmentalism ewaste ewaste Why Go Green Forest Forest Trees Global dimming Global dimming Global warming Global warming Green Go Green Green computing Green computing Green politics Green politics grow oxygen grow oxygen hug Tree hug Nature Free Nature Ozone depletion Ozone depletion Ozone depletion and global warming Ozone depletion and global warming ozone hole ozone hole plant trees now plant trees now Plants New Plants Rainforests Rainforests recycle symbol recycle symbol Recycling Recycling Recycling criticism Recycling criticism Refurbishment Refurbishment tree Plant a tree Tree Graph Tree Graph tree hugging tree hugging used goods used goods village green village green Home green Home green Find green Find green |