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more reactive molecules by the ultraviolet radiation originating from the sun. Some of these molecules, like chlorine radicals and chlorine monoxide then participate in reactions that destroy ozone in “catalytic” cycles made up of two or more separate reactions. As a result, a single chlorine or bromine atom can destroy many thousands of ozone molecules before it leaves the stratosphere and returns to the lower atmosphere where these reactive chlorine and bromine gases are removed from Earth’s atmosphere by rain and snow. The most severe and most surprising ozone loss was discovered to be recurring in springtime over Antarctica. The loss in this region is commonly called the “ozone hole” because the ozone depletion is so large and localized. In response to the prospect of increasing ozone depletion, the governments of the world crafted the 1987 United Nations Montreal Protocol as an international means to address this global issue. Thanks to development of “ozone-friendly” substitutes for the now-controlled “Ozone Depleting Substances” substances, such as chloro-fluoro-carbons or CFCs long used a.o. in most refrigeration and air conditioning systems, the total global accumulation of ODS has slowed and begun to decrease and initial signs of recovery of the ozone layer have been identified. Production and consumption of all principal ODS by developed and developing nations has already been largely decreased and will be almost completely phased out before the middle of the 21st century. Tropospheric ozone is that which is present in the lower atmosphere the troposphere; with a height of 5km to 15km depending on your latitude. Throughout most of the troposphere, ozone concentrations are relatively low . However, concentrations of ozone can be higher very close to the surface at local levels; there it forms as an air pollutant and can negatively impact on human health.Ground-level ozone can form through chemical reactions between local air pollutants such as nitrous oxides , volatile organic compounds and sunlight. These air pollutants are emitted from motor vehicle exhausts, industrial processes, electric utilities, and chemical solvents. Ground-level ozone can have negative impacts on human health; breathing ozone is particularly harmful for the young, elderly and people with underlying respiratory problems. It is therefore commonly referred to as ‘bad’ ozone. However, some substitutes for ozone depleting substances will continue to contribute to global climate change if concentrations rise above current levels. Some of the plant-derived material coming from terrestrial ecosystems is transported to the ocean as terrestrially derived particulate organic matter where most of it will be consumed by organisms but some will sink into the sediments or break down into DOM. Current research has indicated that light-induced conversion of tPOM to DOM is primarily driven by the UV-B part of solar radiation that is sensitive to changes in

the baltimore orioles baseball full printing flip flops 2
the baltimore orioles baseball full printing flip flops 2

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