The ozone layer has been depleting since the late 1970s. If all goes according to plan, ozone levels in the region could return to pre-hole conditions within 40 years.In other regions where ozone depletion has been less severe, the return to normalcy could come even sooner.
Buoyed by signs of improvement on the ozone layer, we might have good reason to think this might be a boon for global warming. After 30 years, the ozone hole still continues to be an annual occurrence.
Some regions are recovering faster than others.
As a result, the upper ozone layer above the Northern Hemisphere should be completely repaired in the 2030s and the gaping Antarctic ozone hole should disappear in the 2060s, according to a scientific assessment released Monday at a conference in Quito, Ecuador. "The careful mix of authoritative science and collaborative action that has defined the protocol for more than 30 years and was set to heal our ozone layer is precisely why the Kigali Amendment holds such promise for climate action in future", Solheim added.More news: Fossil Sport watch announced with Wear 3100 and ultra lightweight body
It was put on the path of recovery due to the globally-agreed actions that did not remain on paper as in case of climate change but were implemented as per the agreed schedule under the historic Multilateral Environmental Agreement called the Montreal Protocol.
The challenge will lie in keeping up this momentum.
The Assessment, which is meant to add to the scientific basis for decisions made by the Parties to the Montreal Protocol, also presents updated scenarios for hastening ozone recovery through: Complete elimination of controlled and uncontrolled emissions of substances such as carbon tetrachloride and dichloromethane, Bank recapture and destruction of chlorofluorocarbons (CFCs), halons, and hydrochlorofluorocarbons (HCFCs) and Elimination of HCFC and methyl bromide production, as well as the Mitigation of nitrous oxide emissions. These chemicals usually break down in less than six months, but simulations show that dichloromethane and other so-called "very short-lived substances" (VSLS) account for a significant portion of ozone loss in the stratosphere.
The Montreal Protocol made two decades of ozone healing possible, but the urgency of this week's meetings suggests its longterm success is no longer a given.More news: Facebook Messenger's unsend feature is coming soon
Over the past decade, dichloromethane became approximately 60% more abundant in the atmosphere as compared to the early 2000s. It's all thanks to the Montreal Protocol, a treaty created to stop the spread of ozone-depleting substances (ODS). PVC manufacturing has surged in the last couple of years in China, its main hotspot.
However, while most of the banned gases have been phased out, the report found at least one violation of the protocol: an unexpected increase in production and emissions of CFC-11 from eastern Asia since 2012. It calls for additional cuts to ODS, specifically hydrofluorocarbons. It is past time to take that lesson to heart when it comes to climate change. Phasing them out could avoid as much as 0.5C (0.9F) of warming this century. There's still work to be done, but this definitely falls into the Good News category."We're at the turnaround point", Paul Newman, a scientist who helps run NASA's Ozone Watch and chaired the United Nations report, told Earther.The report is put out every four years, and this is its fifth iteration.
"Carbon dioxide emissions remain by far the most important greenhouse gases which are driving global warming".More news: Lakers sign Tyson Chandler