日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Environment

Hole in protective layer on road to recovery in decades

By HOU LIQAING | China Daily | Updated: 2024-02-22 10:25
Share
Share - WeChat

A hole found in the ozone layer, which protects lives on the Earth by shielding it from the sun's most harmful rays, is on track to recover in the next four decades, according to a United Nations-backed panel of experts.

The panel also found that the treaty that made that possible has played a big role in mitigating climate change.

A colorless active gas, ozone reacts readily with a great many other substances. It is listed as one of the major air pollutants near the ground, as even relatively low amounts of the gas can cause lung damage and result in shortness of breath.

However, the ozone layer, about 20 kilometers above the ground, helps shield the Earth from harmful ultraviolet radiation known as ultraviolet B.

After the discovery of the ozone hole in the 1980s, the Montreal Protocol on Substances that Deplete the Ozone Layer was adopted in 1987 to regulate the production and consumption of nearly 100 human-made chemicals that deplete the ozone layer. It has since been ratified by 198 parties.

The latest quadrennial assessment report by a UN-backed scientific assessment panel said the accord has succeeded in safeguarding the ozone layer.

If current policies remain in place, the ozone layer is expected to recover to 1980 values by around 2066 over the Antarctic, by 2045 over the Arctic and by 2040 for the rest of the world, according to a report by the panel published in late 2022.

Variations in the size of the Antarctic ozone hole, particularly between 2019 and 2021, were driven mainly by meteorological factors, it said. Nevertheless, the area and depth of the Antarctic ozone hole have been slowly decreasing since 2000.

The report also reaffirmed that the treaty has played a positive role in climate change mitigation.

It said new studies supported previous assessments that the decline in emissions of ozone-depleting substances due to compliance with the Montreal Protocol would reduce global warming by approximately 0.5 to 1 C by midcentury compared to an extreme scenario in which ODS emissions increased by 3 to 3.5 percent a year.

A 2016 amendment to the Montreal Protocol, known as the Kigali Amendment, is also expected to contribute to the global endeavor to cope with global warming, the report said.

The amendment calls for a gradual reduction in the consumption and production of hydrofluorocarbons, which are used to replace ODS in foam-blowing agents and refrigerants but are powerful heat-trapping gases.

Compliance with the Kigali Amendment will help reduce global warming by 0.3 to 0.5 C by the end of this century, the report said.

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 亚洲免费视频在线观看 | 婷婷丁香社区 | 日本一区二区三区中文字幕 | 天天操天天操天天操香蕉 | 黑人精品| 亚洲视频在线看 | 一级毛片免费观看不收费 | 国产精品日韩欧美在线第3页 | 久久成人在线视频 | 亚洲看片网 | JLZZJLZZ亚洲乱熟在线播放 | 天天摸天天操天天干 | 日本午夜看x费免 | 成年视频网站免费观看 | 欧美一级视 | 久久九九国产精品 | 亚洲 欧美日韩 国产 中文 | 久久久久成人精品 | 成人啪啪97丁香 | 精品国精品国产自在久国产应用 | 免费中文视频 | 亚洲高清视频在线 | 成人在线第一页 | 久操导航 | 综合精品在线 | 欧美激情人成日本在线视频 | 日本高清视频在线三级 | 性69交片免费看 | 欧美黄视频 | 欧美成在线视频 | 欧美亚洲视频一区 | 色呦呦tv | 国模无水印一区二区三区 | 韩国精品一区 | 国产精品成人一区二区 | 噜噜色网 | 男人添女人下面免费网站 | 久久亚洲国产精品无码一区 | 新版天堂资源中文在线 | 美女网站在线观看视频18 | 四虎在线免费观看 |