More UV protection: United Nations says Earth’s ozone layer is healing
08 Novembre, 2018, 06:34 | Auteur: Therese Cote
Without it, skin and eye damage can occur, and evidence suggests a rise in skin cancers associated with the thinning of the ozone layer.
A hole was first found in the ozone layer - which shields from the sun's harmful rays - above Antarctica back in the 1980s, as the result of harmful chemicals being released into the atmosphere.
'If ozone-depleting substances had continued to increase, we would have seen huge effects.
The report said the source country or countries had not yet been identified.
The Montreal Protocol was finalized in 1987 in response to the realization that numerous chemicals used in aerosols, air conditioning systems, refrigerators, and industrial solvents were eroding the planet's stratosphere, creating a hole and allowing harmful levels of ultraviolet radiation to seep through the ozone layer.
Aerosol spray and coolants made before the ban contained man-made chemicals called chlorofluorocarbons (CFCs), which released chlorine and bromine that ate away at the ozone.
Paul Newman, chief Earth scientist at Nasa's Goddard Space Flight Center, described the discovery as "really good news".
The ozone layer starts at about 6 miles (10 kilometers) above Earth and stretches for almost 25 miles (40 kilometers); ozone is a colorless combination of three oxygen atoms.
This year, the ozone hole over the South Pole peaked at almost 9.6 million square miles (24.8 million square kilometers). Since 2000, it has increased by about 1 to 3 percent per decade, the report said.
But it's not a complete success yet, said University of Colorado's Brian Toon, who wasn't part of the report.
And if recovery rates continue as they are predicted to do, the report says the Northern Hemisphere and mid-latitude ozone should be fully recovered by the 2030s, the Southern Hemisphere ozone in the 2050s, and the polar regions before 2060.
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. And the Montreal Protocol is set to be enhanced in early 2019 with the ratification of the Kigali Amendment, which seeks to curb future climate change by targeting powerful greenhouse gases used in refrigeration and air conditioning.
Scientists have also noted that the recovery of the ozone layer above Antarctica could slightly worsen the impacts of climate change in that region as the hole in the protective layer there has shielded the area from the full impacts of global warming.
Mr Newman added: "I don't think we can do a victory lap until 2060, ' he said".
Durwood Zaelke, president of the Institute for Governance and Sustainable Development, said: "Over the last three decades, the Montreal protocol has fulfilled its original objective to heal the ozone layer".
Pour ce prix, Xiaomi propose des écouteurs sans-fil intra-auriculaires utilisant le Bluetooth 5 .0 et dotés d'embouts en silicone. Les écouteurs étant assez massifs, ils ne conviendront probablement pas à toutes les formes d'oreilles.
Trump spent election night watching returns with family and friends at the White House, his shadow looming large over the results. Trump boasted a growing economy but campaigned aggressively in the closing days on a hardline anti-immigration message.
He is also now the showrunner, executive producer, and writer on the upcoming CBS series "Blood & Treasure". Elmore's history includes work as a writer and co-executive producer on CBS' Limitless and FX's Justified .
Quatrième de Ligue 1, Lyon a pu compter sur Jason Denayer durant l'intégralité de la partie pour affronter à domicile Hoffenheim. Benfica (4) est troisième, tandis que l'AEK (0) est définitivement éliminé de la compétition .
Christmas' rep told E! Her vehicle was seized instead and she was ordered to turn herself in at a later date. Following her arrest, Christmas has been very active on social media, sharing memes and selfies.
The incident turned out to be a false alarm, however, and officials determined the object didn't pose any danger. The security alert also led to the evacuation of Madrid's Atocha station while police investigated.
CBS Sports NFL Insider Jason La Canfora identified the Falcons - along with the Patriots and Seahawks - as a likely landing spot. With $3.8 million left on his contract, the defensive lineman cleared waivers on Tuesday and was a free agent.
According to the Energy Department, almost half of all US households use natural gas as the primary source for heating. Now, the worst month for USA stocks in seven years has made several of his favorite companies significantly cheaper.
'Breaking Bad' Movie From Creator Vince Gilligan In The Works
This will be the second Breaking Bad spinoff - the first, of course, Better Call Saul , which recently wrapped a fourth season. The film is largely expected to follow the next steps of Jesse Pinkman , the ex-pupil of Bryan Cranston's Walter White .
Early rising women at lower risk of breast cancer
The findings have been published on researchers' website bioRxiv but have not yet gone through scientific peer review. A University of Bristol study has found a link between early risers and a lower risk of breast cancer .
Deb Haaland: First Native American woman elected to Congress
Alexandria Ocasio-Cortez's surprise victory in the June congressional primary in NY shook up Washington and the Democratic Party. Together, we made history! Representing Minnesota, she will be the first Congress member to wear a hijab or head scarf.
Kevin Harvick stripped of berth in NASCAR championship race
Now Harvick's team has been rocked by a penalty that may change the composition of the final four drivers racing for the title. He had joined Joey Logano as the only drivers locked into next weekend's championship race at Homestead-Miami Speedway.