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Climate change: The environmental disasters we've almost fixed
There are no simple solutions to complex problems like climate change. But there have been times in the past when the world has come together to try to fix an environmental crisis.
How did we deal with acid rain, for example, or the hole in the ozone layer? And are there lessons for tackling the bigger issue of global warming?
1970, '80s and '90s: Acid rain
酸雨 ：1970 - 1990年代
It's the 1980s, and fish are disappearing in rivers across Scandinavia. Trees in parts of the forests are stripped bare of leaves, and in North America some lakes are so devoid of life their waters turn an eerie translucent blue.
The cause: Clouds of sulphur dioxide from coal-burning power plants are travelling long distances in the air and falling back to Earth in the form of acidic rain.
"In the '80s, essentially the message was that this was the largest environmental problem of all time," says Peringe Grennfelt, a Swedish scientist who played a key role in highlighting the dangers of acid rain.
把酸雨的成因、危害和应对方式推上媒体头条的关键人物之一，是一位名叫格兰费尔特（Peringe Grennfelt） 的瑞典科学家。他说，“在80年代，人们心目中有史以来最大的环境问题就是它（酸雨）。”
Headlines warning of the threats of acid rain were commonplace. For years there had been obfuscation, denial and diplomatic stand-offs, but once the science was settled beyond doubt, calls for action quickly gathered momentum. It led to international agreements curbing the pollutants from burning fossil fuels that acidify rain.
Amendments to the Clean Air Act in the US saw the development of a cap and trade system, giving companies an incentive to reduce emissions of sulphur and nitrogen, and trade any excess allowances. Each year, the cap was ratcheted down until emissions dropped dramatically.
美国空气清洁法案修订案（Clean Air Act）出台，引导和鼓励厂矿企业减少硫酸、硝酸排放，规定了排放上限和交易体系，允许企业在体系中交易剩余配额。而且，排放上限每年下调，直至有害酸性气体排放大幅度减少。
So did it work? Acid rain is now largely a thing of the past in Europe and North America, although it remains a problem elsewhere, particularly in Asia.
However, Canadian scientist John Smol, a young researcher back in the 1980s, says in many ways acid rain was a "success story", showing that countries can come together and deal with an international problem. "If you don't price pollution, people will pollute. We learned that for sure," he says.
1980s: The ozone hole
In 1985, news of another looming environmental problem hit the headlines. Scientists from the British Antarctic Survey (BAS) alerted the world to a large and expanding hole in the ozone layer above the Antarctic. It was caused by the chlorofluorocarbons - greenhouse gases better known as CFCs - then used in aerosols and refrigerants.
1985 年，又一个紧迫的环境问题成了头条新闻。 英国南极调查局 (BAS) 的科学家们向世界发出警报，提醒世人，南极上方的臭氧层中存在一个巨大空洞，而且这个空洞在不断扩大。造成这个空洞的罪魁是氯氟烃，即所谓的温室气体，有一个人们更熟悉的名字叫 CFC，当时广泛用于气溶胶和制冷剂。
"Suddenly it goes 'boom', and it drops really quickly," says BAS polar scientist Anna Jones, referring to the dramatic thinning of the band of gas that shields the planet from harmful UV rays.
BAS 极地科学家琼斯 (Anna Jones) 指出，为地球上的万物和人类抵挡杀伤力极强的紫外线的臭氧层正在迅速变薄，“突然嘭地一下就破了，（穿透之处臭氧含量）急剧下降。”
Ozone over the Antarctic had been diminishing since the 1970s, but news the hole now covered the entire Antarctic continent triggered worldwide alarm. In 1987, world leaders signed the landmark Montreal Protocol, hailed as one of the most successful environmental treaties of all time.
自 1970 年代以来，南极上空的臭氧一直在减少，但鲜为人知，没有引起关注。英国科学家拉响了全球警报。臭氧层毁损严重成为国际大事。1987年，世界各国领袖在加拿大签署了被誉为有史以来最成功的环境条约之一的《蒙特利尔议定书》。
Ozone-depleting chemicals were phased out, with industry switching to "CFC-free" aerosol cans that appealed to green consumers. "It was a global problem, but industry, the scientists, the policymakers came together," says Dr Jones. "They acted quickly; they acted with a mechanism that allowed continual tightening of that protocol. It's a very important template for how you can make things work."
Despite the success of the Montreal Protocol, there have been setbacks. It was discovered that hydrofluorocarbons (HFCs), developed as alternatives to ozone-depleting chemicals, were potent greenhouse gases.
《蒙特利尔议定书》取得了成功，也遇到了挫折。人们发现，作为消耗臭氧层化学品的替代品开发的氢氟碳化合物 (HFC) 其实是一种强大的温室气体。
And while the ozone hole is "on the road to recovery", ozone-depleting chemicals stay in the atmosphere for a long time, meaning repair is a long, slow process.
1920s to 2020s: Leaded petrol
含铅汽油：1920年代 - 2020年代
For decades we used leaded petrol as fuel - as companies added lead additives to help petrol burn more efficiently. Leaded petrol releases lead particles into vehicle exhausts that can be breathed in, causing a variety of health problems, including heart attacks, strokes and impaired mental development in children.
After a long battle between scientists, regulatory authorities and industry, a consensus around the health risks emerged, and rich nations banned leaded petrol from the 1980s onwards.
经过科学家、监管机构和行业之间的长期斗争，围绕健康风险达成了共识，富裕国家从 1980 年代起禁止使用含铅汽油。
Use in developing countries lingered on, however, owing to the fuel being cheaper to produce than unleaded petrol. Following a long campaign by NGOs, industry groups and governments, under the umbrella of the United Nations Environment Programme (UNEP), the final drop of leaded petrol was pumped into a car's tank only months ago.
然而，由于这种燃料的生产成本低于无铅汽油，因此在发展中国家的使用仍在继续。 经过非政府组织、行业团体和政府的长期运动，在联合国环境规划署 (UNEP) 的保护下，几个月前最后一滴含铅汽油才被注入汽车油箱。
And while the world has officially eradicated leaded fuel, lead pollution lingers on in the environment in dust and soil, where it can persist for a long time.
Lessons for climate change?
With climate change dominating the news agenda, we hear very little nowadays about the likes of the ozone hole. Yet, there are parallels between these crises and the monumental one that is climate change.
For a long time, acid rain was a source of international conflict, with some denying its very existence and the fossil fuel industry pitted against environmentalists. Does that sound familiar?
According to Prof Smol, the debates and discussions over acid rain were training for the more complex issues of climate change. "The first lesson I learned was that we had to effectively communicate the results of our studies, not just to other scientists but to policymakers and the public at large," he says.
"If there is an information vacuum, it will be immediately filled by vested interest groups."
Prof Smol says the situation is even more complicated today, with the growth of social media and the spread of misinformation.
When it comes to the international push to eliminate leaded fuel, Rob de Jong, head of UNEP's sustainable mobility unit, says a key lesson was the value of a harmonised approach. "The whole leaded petrol campaign heavily invested in public awareness, heavily invested in social and community action, heavily invested in focusing on the impact this has on children."
在谈到消除含铅燃料的国际努力时，联合国环境署可持续交通部门负责人德荣（Rob de Jong）表示，一个很有价值的经验是协调一致的方法。“整个（淘汰）含铅汽油运动大力投资于提高公众认知，大力投资于社会和社区层面的行动，大力投资于唤起各界重视含铅汽油对儿童的影响。”
And the steps taken by the international community to reduce ozone-depleting chemicals show - on a smaller scale - the kind of co-operation that will be needed to tackle the warming world.
"The climate change problem is much more complicated to solve than the ozone problem because we don't have immediate alternatives to fossil fuels in the way that we had alternatives to CFCs," says Dr Jones. "But, that's not a reason for not doing something - the problem is too important, it's too big and they need to get on with it.
琼斯说：“气候变化问题比臭氧问题要复杂得多，因为我们没有像氟氯化碳那样的化石燃料直接替代品。但是，这不是不行动的理由 —— 这个问题太重大，需要持续不断地应对。
"When industry and governments have come together in the past they have solved a globally-threatening environmental problem - now they need to show they can do it again."
报道员 李俊杰 刘华渝 华商报新闻记者 宁军。
First known US Omicron case found in fully vaccinated overseas traveler******
The United States on Wednesdayidentified its first known COVID case caused by the Omicronvariant, discovered in a fully vaccinated patient who traveledto South Africa, as scientists continue to study the risks thenew version could pose.。
Public health officials said the infected person, who hadmild and improving symptoms, returned to the United States fromSouth Africa on November 22 and tested positive seven days later.。
That patient was fully vaccinated but did not have a boostershot, according to Dr. Anthony Fauci, the top US infectiousdisease official, who briefed reporters at the White House.。
Dr. Anthony Fauci speaks about the Omicron coronavirus variant case, which was detected in California, during a press briefing at the White House in Washington, US, on December 1, 2021.。
The person is in self-quarantine and all of the patient'sclose contacts have tested negative, he said.。
Key questions remain about the new variant, which mutated inways that health experts think could improve its ability to bothspread and evade some of the defenses provided by vaccines. Workis underway to update those vaccines, if necessary.。
Omicron has been found in two dozen countries and territories, includingseveral in Europe plus Canada, Australia, Japan, China's Hong Kong andIsrael.。
The United States has not yet detected communitytransmission of Omicron. Across much of the country, COVIDtransmission remains high but new cases have held fairly steadyover the last two weeks, according to a Reuters tally.Three-quarters of all COVID samples in South Africa are now Omicron.。
"The critical thing is, over the next week or so, will wesee any community transmission from that case," said AndyPekosz, virologist at the Johns Hopkins Bloomberg School ofPublic Health. "That's a critical thing that we want to keep aneye on."
Pekosz said the variant could make the relatively new set ofantiviral pills from Merck and Pfizer moreimportant by helping to reduce the severity of infections.。
Fauci said it could take two weeks or more to gain insightinto how easily the variant spreads from person to person, howsevere is the disease it causes and whether it can bypass theprotections provided by vaccines currently available.。
The Biden administration has asked fully vaccinated peopleto seek booster shots after their initial doses. Sixty percentof Americans are fully vaccinated andabout a fifth of those people took boosters, according to theUS Centers for Disease Control and Prevention.。
For days, US health officials have said the new variant– first detected in southern Africa and announced on November 25 – was likely already in the United States as dozens of othercountries also detected its presence.。
Travelers wear protective face masks at Denver International Airport on November 30, 2021 in Denver, Colorado as concern grows worldwide over the Omicron coronavirus variant.。
"This new variant is a cause for concern but not a cause forpanic," Biden said on Wednesday before the Omicron case wasannounced. A spokesperson, Jen Psaki, said he the president hadbeen briefed by his team on the first known US case.。
Benchmark US stock indexes turned negative on the news.The S&P 500 fell by more than 1 percent, extending to nearly 4 percentits loss in price terms over the past week. The World HealthOrganization named the variant as one of concern on Friday.。
The United States has barred nearly all foreigners who havebeen in one of eight southern African countries. On Tuesday, theCDC directed airlines to disclose names and other information of passengers who have been to thosecountries.。
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