Saturday, 20 July, 2019

Earth’s ozone layer is healing

Benjamin Butterworth     2 hours Tuesday November 6th 2018   

						Informer cast who stars with Paddy Considine in the new BBC drama?	
		Television Benjamin Butterworth 2 hours Tuesday November 6th 2018 Informer cast who stars with Paddy Considine in the new BBC drama? Television
Sandy Nunez | 08 November, 2018, 20:55

"We don't need absolute certainty to act", he said. It is past time to take that lesson to heart when it comes to climate change. Then again, it might be a glass half full kind of thing.

Close to the ground, this oxygen-based molecule isn't all that welcome.

At around 20 to 30 kilometres (12 to 19 miles) overhead, a rise in ozone density does a satisfactory job of soaking up a healthy proportion of that UV radiation without causing us grief. The ozone hole is driven by a number of chemicals that were commonly found in aerosol cans, air conditioners, and refrigerators, called chlorofluorocarbons and hydrochlorofluorocarbons. That's because the ozone-eating refrigerants in those fridges were banned, due to the Montreal protocol signed back in 1987, which was "apparently, back when everyone still believed in science and chemical companies had less power".

Several decades later, it's hard to disagree.

The study, Scientific Assessment of Ozone Depletion: 2018, monitors ozone recovery, and it is the latest in a series of reports that the United Nations releases every four years.

Concentrations of both total tropospheric chlorine and total tropospheric bromine have waned since the 2014 assessment.

"Evidence presented by the authors shows that the ozone layer in parts of the stratosphere has recovered at a rate of 1-3 percent per decade since 2000", U.N. Environment and the World Meteorological Organization said in a statement.

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We will remind, the incident occurred on the morning of November 5, Aubagne street in the Central part of Marseille. Castaner said inspectors had visited number 65 on October 18, and were concerned but did not see cause to evacuate.

As a result, something significant is happening, and the upper ozone layer above the Northern Hemisphere should be completely repaired by 2030and the gaping Antarctic ozone hole should disappear in the 2060s, according to this critical scientific assessment that has been released Monday at a conference in Quito, Ecuador.

This doesn't mean we can pack up and start planning the fireworks quite yet. "We stopped that", he says.

Over the years, the protocol has been amended in light of new scientific findings.

This agreement is now projected to reduce future global average warming in 2100 due to hydrofluorocarbons (HFCs) from a baseline of 0.3-0.5-degrees C to less than 0.1-degree C. Cross your fingers all goes as planned. An amendment to the Montreal Protocol that goes into effect next year would cut use of some of those gases. In fact, the fight over the ozone layer in the mid-to-late 1980s somewhat mirrors the current debates surrounding global warming.

"The Montreal Protocol is one of the most successful multilateral agreements in history for a reason", said Solheim. Case in point: The ozone hole, which if everything goes according to plan could be healed up by the 2060s, according to a new report from the United Nations.According to the report, a decades-old worldwide treaty to ban ozone-depleting chemicals has led to their decline and "much more severe ozone depletion in the polar regions has been avoided".

Last month's release of the UN's Intergovernmental Panel on Climate Change report sent shockwaves across the globe, highlighting how much damage an increase of two degrees Celsius would have on our planet.