Ashrita's Poem, 'Save The Ozone Layer'
stratospheric ozone—is a fascinating one of science and . mentioned the AMA in connection with methyl chloride and the CFCs Changed Our World and Endangered the Ozone. Layer (25) .. following lines from a poem he had written . For O3 let's not be the slayer. Who will stitch the earth's umbrella,. Let's all plant trees and not just read novella. CFC's O3's greatest enemy. The ozone layer is getting depleted by the action of chlorofluorocarbons (CFCs) used as a coolant in refrigerators and in perfumes. When CFCs are released.
Once released, these ozone-destroying molecules do their dirty work, breaking apart the molecular bonds in UV radiation-absorbing ozone. The Montreal Protocol Anniversary poster of the Vienna Convention for the Protection of the Ozone Layerthe first international cooperation effort to protect the ozone layer.
United Nations Environmental Program. CFCs were commonly found in refrigerants, solvents, propellants, and foam-blowing agents before the Montreal Protocol was agreed on in the s— an international commitment to phase out ozone-depleting chemicals that was universally ratified by all countries that participate in the UN.
The Montreal Protocol set an important precedent but more needs to be done. It appears unlikely that the decrease in ozone-depleting substances alone will lead to the recovery of the stratospheric ozone layer to its pre concentration levels because of the competing and uncertain effects of further climate change.
In a worrying development, after an extremely cold winter in earlyfor the first time the ozone reduction in the Arctic was comparable to that in the Antarctic. Stratospheric ozone also has natural processes that remove it from the atmosphere.
Tiny sulfate particles aerosols blasted into the stratosphere by the volcanic eruption of Mount Pinatubo in caused measurable decreases in ozone for several years following the eruptions. Does global warming have an impact on the stratospheric ozone layer? Temperature change in both the lower stratosphere and the lower troposphere go in opposite directions--a telling sign of excess carbon dioxide in the troposphere. Since the s, there has been a trend of increasing warming of the lower atmosphere and a cooling of the upper atmosphere.
Chapter 1 - Introduction to Chemistry Flashcards Preview
This warming-cooling dynamic creates conditions that lead to ozone loss. Observations show that as greenhouse gases increase and result in heating in the lower atmosphere tropospherea cooling is occurring in the upper atmosphere stratosphere. Largely because heat from Earth's surface that normally would convey through the troposphere and stratosphere, and eventually escape to space, is now being trapped or confined to the troposphere.
The increasing temperatures at the Earth's surface and decreasing temperatures in higher parts of the atmosphere can be partly explained using the blanket analogy. Carbon dioxide and other heat-trapping gases rise into the atmosphere and spread around the globe, like a blanket wrapping Earth. This blanket warms the surface of the Earth and protects it from the cold air above it.
Chapter 1 - Introduction to Chemistry Flashcards by Pam Colvin | Brainscape
Fossil fuels are more pervasive than ever, with a bigger industrial lobby protecting and promoting them. We have all to a greater or lesser degree been brought up to be dependent on them — from brushing our teeth in the morning to locking the garage at night.
Their use is also not only a problem in isolation, but has literally fuelled us to overconsume, and hence overburden, countless planetary ecosystems on which we depend. In this challenge, it is not enough that we substitute clean energy for dirty energy — in the same way as substitutes for CFCs were found — but that we change habits of consumption that have been fostered during the brief era of cheap fossil fuels.
Nevertheless, certain parallels between the ozone triumph and the danger of climate change are clear. There is a scientific consensus about the threat the problems pose to life and human civilisation. And in both cases the main culprit is also clear.
The ozone layer is recovering – there’s hope for the environment yet
It remains within our power to act, and there might be even more to gain from action on climate change too. They contain fluorine atoms, carbon atoms and chlorine atoms.
CFCs have been found to pose a serious environmental threat. Studies undertaken by various scientists during the s revealed that CFCs released into the atmosphere accumulate in the stratosphere, where they had a deleterious effect on the ozone layer.
Stratospheric ozone shields living organisms on Earth from the harmful effects of the Sun's ultraviolet radiation; even a relatively small decrease in the stratospheric ozone concentration can result in an increased incidence of skin cancer in humans and in genetic damage in many organisms.
In the stratosphere the CFC molecules break down by the action of solar ultraviolet radiation and release their constituent chlorine atoms. These then react with the ozone molecules, resulting in their removal. CFCs have a lifetime in the atmosphere of about 20 to years, and consequently one free chlorine atom from a CFC molecule can do a lot of damage, destroying ozone molecules for a long time.
Although emissions of CFCs around the developed world have largely ceased due to international control agreements, the damage to the stratospheric ozone layer will continue well into the 21st century.