Chlorofluorocarbons and Ozone Depletion - American Chemical Society
2017年4月18日 · At the University of California, Irvine, F. Sherwood Rowland and Mario J. Molina discovered that chlorofluorocarbons (CFCs) could deplete Earth’s atmospheric ozone layer, which blocks the sun’s damaging ultraviolet rays.
What happened to the world's ozone hole? - BBC
A mere decade later, in 1985, the British Antarctic Survey confirmed a hole in the ozone layer and suggested a link to CFCs – vindicating the work of Molina and Rowland, who were eventually...
Ozone layer 'rescued' from CFC damage - BBC
2021年2月10日 · A steady decline in the levels of ozone-harming CFC chemicals in the atmosphere has resumed, scientists say. This follows a recent, dangerous pause in that downward trajectory, which could have...
The last ozone-layer damaging chemicals to be phased out are …
2024年6月11日 · The most well known of these are chlorofluorocarbons (CFCs). Starting in 1989, the protocol phased out the global production of CFCs by 2010 and prohibited their use in equipment like...
Global increase of ozone-depleting chlorofluorocarbons from …
2023年4月3日 · An increasing abundance of CFCs in the atmosphere was the primary driver behind stratospheric ozone depletion and the Antarctic ozone hole. In response, nations agreed that the production of...
NASA Study: First Direct Proof of Ozone Hole Recovery Due to …
2018年1月4日 · The Antarctic ozone hole forms during September in the Southern Hemisphere’s winter as the returning sun’s rays catalyze ozone destruction cycles involving chlorine and bromine that come primarily from CFCs. To determine how ozone and other chemicals have changed year to year, scientists used data from the Microwave Limb Sounder (MLS ...
CFCs break down the Earth’s ozone layer, Rowland and Molina were key in convinc-ing scientists, policymakers, and the general public about the harmful effects of CFCs. Their unprec-edented advocacy ultimately led to the phasing out of CFCs worldwide through the pas-sage of the Mon-treal Protocol in 1987. The research of Rowland and Molina brought
Renewed and emerging concerns over the production and emission of ozone ...
2020年4月30日 · Stratospheric ozone depletion, first observed in the 1980s, has been caused by the increased production and use of substances such as chlorofluorocarbons (CFCs), halons and other...
An unexpected and persistent increase in global emissions of ozone ...
2018年5月16日 · The Montreal Protocol was designed to protect the stratospheric ozone layer by enabling reductions in the abundance of ozone-depleting substances such as chlorofluorocarbons (CFCs) in the...
How Do CFCs Damage The Ozone Layer? - Sciencing
2018年3月13日 · The ozone layer is about 300 to 500 DU thick on average, which is about the thickness of two stacked pennies. Scientists first began to realize the potential for chlorine to interact destructively with ozone in the early 1970s, and Sherwood Rowland and Mario Molina warned of the danger that CFCs posed to the ozone layer in 1974.