ozone shield

ozone shield

the layer of ozone that hangs in the atmosphere from 20 to 40 miles above the surface of the earth and protects the earth from excessive ultraviolet radiation. Some experts claim that the manufacture of various chemicals, such as chlorofluorocarbons used as propellants in aerosol sprays, and the effects of high-flying jet aircraft are destroying this protective layer and allowing excessive amounts of ultraviolet radiation to penetrate the earth's atmosphere, thus subjecting humans to increased dangers of skin cancer and other health problems. Some chemistry experts and federal health officials also claim that an additional threat comes from nitrous oxide in nitrogenous fertilizers rising into the atmosphere and reacting unfavorably with the ozone shield. The ozone shield is implicated in certain health problems that affect some air travelers. See also ozone sickness.
References in periodicals archive ?
With the ElemMate's help, Evie is able to repair the ozone shield and create an oasis in the Sahara Desert.
Mars has no ozone shield and no magnetospheric shielding, and ice caves would also provide shelter from ionizing and ultraviolet radiation," said Schulze-Makuch.
Besides the issues cited in the title, he covers Earth's ozone shield, acid rains on Canadian-US relations, caribou in the oil patch, the US-USSR science agreement, human rights and the environment, and fishing in the donut hole.
This threat is the high levels of ultraviolet radiation (UV) now striking the Earth due to the continued thinning of the ozone shield.
The same event would have destroyed the planet's protective ozone shield and thus killed many land and marine plants.
The bad news was the discovery that four new man-made chemicals, which are not covered by the 1987 treaty, could pose a new threat to the ozone shield.
Dermalogica's Environmental Control System skincare products contain botanicals such as lemon, fumitory and fumaric acid which create an anti- ozone shield for the skin, counteracting reactive ozone before it causes harm.
The crises are also familiar: the buildup of greenhouse gases, acid rain, tropical deforestation, loss of biodiversity, depletion of the stratospheric ozone shield, population growth, and soil loss.
Pressed by the chemical industry and alarmed by the prospect of organized crime subverting the global effort to protect the ozone shield, Western governments are getting tough with the smuggling rings.
If all countries meet their commitments under the treaty, scientists estimate the ozone shield will gradually begin to heal within the next few years, with a full recovery expected by about 2050.
The recent results of their four-year study provide strong evidence that the thinning of the Earth's ozone shield and the resulting increase in dangerous ultraviolet radiation may be the silent stalker of frogs and other amphibians throughout the world.