Sentences with phrase «by destroying ozone»

To its direct toxic effects, it could have also increased surface UV levels by destroying ozone (methane can also do this.)

By destroying ozone (itself a greenhouse gas) in the stratosphere, CFCs also affect the climate indirectly in ways that are still not fully understood.

Not exact matches

Like chlorofluorocarbons (CFCs) and several other ozone - destroying chemicals you may have heard of, CH2Cl2 breaks apart when struck by sunlight.

«New ozone - destroying gases on the rise; not controlled by treaty.»

By next week, 25 % of the Arctic ozone will be destroyed, scientists warn.

This is important, as a molecule of ozone lost in this region has a far larger impact on climate than a molecule destroyed at higher altitudes by longer - lived gases.»

AMERICA's Republicans thumbed their noses at the vast majority of the world's scientists last week by claiming that there is no proof that CFCs are destroying the Earth's ozone layer.

By next week, about 25 % of the Arctic's ozone will be destroyed, he says.

The dangerous pollutant ozone, it turns out, is destroyed by hair and body oils, an oddity revealed when researchers at Missouri University of Science and Technology compared washed and unwashed hair.

But in 1991, in addition to the high - altitude hole, ozone below 13 kilometres was destroyed by chemical reactions involving the volcanic aerosol.

On Earth, oxygen, ozone and methane eliminate each other rapidly and other gases are destroyed by ultraviolet radiation from the sun.

The scientists concluded that as much as 10 per cent of the ozone destroyed so far — which amounts to between 4 and 6 per cent of the preindustrial amount of ozone — has been destroyed by methyl bromide.

On Mars, ozone is just as easily destroyed by the byproducts of water vapor breakdown by ultraviolet sunlight.

A 20 - year study by German scientists has found that the rate of increase of CFC - 12, a chlorofluorocarbon compound that spawns ozone - destroying reactions in the stratosphere, has slowed since 1990, although absolute levels are still rising.

Because they are released in large quantities from tropical oceans, they are rapidly lofted by tropical thunderstorms into the stratosphere within a month or two where they can destroy ozone for a larger portion of their lifetimes.

It is relevant to the work being done by the United Nations Environment Programme that administers the Montreal Protocol and its amendments, the seminal global agreement to ban and phase out ozone - destroying compounds.

Although the vortex broke down around mid-March of that winter, ozone loss continued in a stable remnant and by early April about 70 % of the ozone at 20 km was destroyed in this fragment of the vortex.

Ozone should recover to its pre-1980 levels by the middle of this century and slightly later for Antarctica where the protective gas layer gets extremely thin between August and December every year, the WMO reportedly said, adding that the process can be speeded up by almost 11 years if existing stocks of ozone - depleting products, such as those found in old refrigerators and fire extinguishers are destrOzone should recover to its pre-1980 levels by the middle of this century and slightly later for Antarctica where the protective gas layer gets extremely thin between August and December every year, the WMO reportedly said, adding that the process can be speeded up by almost 11 years if existing stocks of ozone - depleting products, such as those found in old refrigerators and fire extinguishers are destrozone - depleting products, such as those found in old refrigerators and fire extinguishers are destroyed.

Despite the fact that I do have access to the Nature article in question («Arctic trends scrutinized as chilly winter destroys ozone» by Quirin Schiermeier, published in Nature 435, 6 (5 May 2005), doi: 10.1038 / 435006b), I am also confused by the figure.

In 1986, Solomon showed that the ozone was being destroyed by the presence of molecules that contain chlorine and bromine, which come from chlorofluorocarbons (CFCs).

E.g. in 1999/2000 about 30 % of the total column ozone was destroyed by anthropogenic chemical loss, which is considerably less than the maximum loss at 19 - 20 km altitude.

Also, the overall number of ozone molecules destroyed in a vertical column of air was pretty much the same as the number of molecules transported into this column by the average poleward and downward transport of air in the stratosphere.

Their measurements, focusing on a time period in September each year — during which time the colder temperatures in the atmosphere promote the reactions that destroy ozone so that the hole is opening up — show that since 2000, the hole has shrunk by 1.7 million square miles, an area more than half the size of the continental United States.

We've changed the atmosphere in other ways, mainly by adding ozone and aerosols at the ground, and destroying ozone high in the atmosphere with CFCs.

If the principal Judges in the US receive 100,000 emails informing them about the ongoing scheme of crime that is destroying the environment (and the Ozone layer) which is the climate engineering plan that is being implemented by the government in these last decades, nothing will happen?

Nurtured by environmental hysteria and the determination to show all changes in the natural world are due to human activity, the claim CFCs were destroying ozone jumped directly from an unproven hypothesis to a scientific fact.

Lab experiments by Sherwood and Molina in 1974 determined chlorine as the active ingredient in chlorofluorocarbon that destroys ozone.

They are destroyed (albeit slowly) by photo dissociation (sunlight) to release the halo atom which then reacts with ozone leading to its depletion.

The destruction of ozone by CFC compounds requires cold conditions because at these temperatures acidic gases (hydrochloric and sulphuric acid) condense to form ice crystals and surface chemistry reactions with CFCs occur liberating the ozone destroying halogen radicals.

Geoengineering solution to global warming could destroy the ozone layer (04/24/2008) A proposed plan to fight global warming by injecting sulfate particles into Earth's upper atmosphere could damage the ozone layer over the Arctic and Antarctic, report researchers writing in the journal Science.

«(5) include as reductions in greenhouse gases reductions achieved through the destruction of methane and its conversion to carbon dioxide, and reductions achieved through destruction of chlorofluorocarbons or other ozone depleting substances, if permitted by the Administrator under section 619 (b)(9) and subject to the conditions specified in section 619 (b)(9), based on the carbon dioxide equivalent value of the substance destroyed.

Along with the resent reach on ozone - destroying thunderstorms, I wonder if the success of the Montreal Protocol could be endangered by global warming (or in the case of the Arctic winter, stratospheric cooling.)

Bromine atoms released from bromine - containing compounds that reach the stratosphere also destroy ozone by a similar mechanism.

Ozone in the stratosphere is constantly being created and destroyed by the action of light and photochemistry.

As many of you will know, and perhaps recall from living memory, alarm bells started ringing when pioneering research by a group of brilliant chemists (Frank Sherwood Rowland, Mario Molina and Paul Crutzen, who were jointly awarded the Nobel Prize for Chemistry in 1995) showed that chlorofluorocarbons (CFCs), a family of chemicals used in many everyday applications such as refrigeration, air conditioning and aerosols, were destroying the ozone molecules which make up the protective layer shielding Earth from the sun's harmful rays.

Once considered fringe science, geoengineering gained respectability with an essay two years ago by chemist Paul J. Crutzen, who is something of an environmentalist hero — it was his Nobel Prize — winning work on the ozone hole that led to the ban on Freon and other ozone - destroying chemicals.

At altitudes of about 11 to 12 miles (18 to 20 kilometers), more than 80 percent of the ozone present in January had been chemically destroyed by late March.

In a world without the Montreal Protocol, two - thirds of the ozone layer would have been destroyed by 2065, and the UV index, a measure of the strength of the sun's ultraviolet rays, would have tripled, with the tropics seeing a particularly large increase in UV rays reaching Earth's surface.

HCFCs will eventually be replaced by substances called hydrofluorocarbons or HFCs, which do not destroy ozone at all.

Another pathway even less studied is caused by the energetic particle rain at polar regions, where HOₓ and NOₓ chemical species are created in the polar regions of the thermosphere and mesosphere and transported down to the stratosphere where they destroy ozone.

By observing the Bastille Day solar event, Jackman and his colleagues found that the short - term effects of hydrogen oxides destroyed up to 70 percent of the ozone in the middle mesosphere.

The conclusion is based on a finding that bromine and iodine oxide, natural chemicals produced by sea spray and emissions from microscopic sea organisms, destroyed ozone in the atmosphere west of equatorial Africa — destroyed 50 % more ozone than than expected.

Well, yes Robert if «all of the O3 is destroyed by UV «photolysis» (whatever that may be) every few minutes, leading to the formation of free O atoms, — etcetera», — then it seems reasonable, for me to assume that UV radiation is responsible for the making as well as for the breaking of the «ozone hole»

The CFC molecules that destroy ozone also trap heat, but the thinning of the ozone layer does not by itself make the Earth's surface hotter.