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An essential guide to the week’s key developments relating to climate change.

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This week

UN General Assembly

FOSSIL FAILURE:At the UN’s 78th general assembly in New York, secretary general António Guterres said that “the fossil fuel age has failed”, but “stopped short of calling on specific countries”, theNew York Timesreported. On Wednesday, Guterres invited leaders from 34 countries to speak at the first-ever “climate ambition” summit “in recognition of their strong action on climate change” – notably omitting China, the US and the United Arab Emirates,Reutersreported.

FINANCING THE FIGHT:Nigerian president Bola Tinubu told the general assembly that Africa’s fight against climate change must happen “on our own terms”, namely, alongside “overall economic efforts”, reported Nigerian daily thePremium Times. Surangel Whipps Jr, president of Palau, called for “scaled-up climate finance that adequately recognise[s] the context” of small island developing states,Pacific News Servicewrote.

BREAKING THE BANK:On Sunday, an estimated 75,000 people took to the streets of New York to demand stronger action on climate change. The protest was “far more focused on fossil fuels and the industry than previous marches” had been, theAssociated Presswrote. The next day, more than 100 protesters were arrested outside New York’s Federal Reserve Bank,Inside Climate Newsreported.

PM rolls back UK climate commitments

UK U-TURN:UK prime minister Rishi Sunak has made a “major shift on green policies”, announcing “exemptions and delays” to a range of plans and programmes,BBC Newsreported. Among them is a five-year postponement of the ban on new petrol and diesel cars, originally set for 2030. The prime minister “denied he was ‘watering down’ the government’s net-zero commitments”, the outlet added.

‘IN JEOPARDY’:亚慱官网analysis showed that these policy changes “could put the UK’s legally binding emissions targets in jeopardy”, as well as its commitment under the Paris Agreement. Carbon Brief has also just published anin-depth Q&Awhich includes a factcheck of Sunak’s claims and policy announcements. Despite Sunak’s emphasis on being “honest with the public” about the “unacceptable costs” of net-zero, the assessment makes it clear that many of his statements were misleading and his policy changes could cost consumers billions of pounds.

Around the world

• CLIMATE (RE)COMMITMENT:Brazil’s government has approved amending the country’s pledge under the Paris Agreement returning it “to the level of climate ambition of 2015”, according to the Brazilian newspaperFolha de São Paulo.
• ‘LEGAL BLITZKRIEG’:California has filed a lawsuit against five oil majors, seeking billions of dollars to cover future damages from climate change. The state’s suit alleges wrongdoing on many counts, including misleading the public, violating state pollution regulations and defrauding investors, San Jose’sMercury Newsreported.
• LIBYA’S UNREST:“Hundreds of protesters” in Libya are accusing their government of neglect after more than 10,000 people died in catastrophic flooding last week, theNorth Africa Journalsaid. Analysis covered by亚慱官网has shown that the extreme rainfall was made up to 50% more intense by climate change.
• OFF-TARGET:Climate change and conflict mean the world is “likely to miss” targets to end the spread of HIV/Aids, tuberculosis and malaria by 2030,Reuterswrote. Warmer temperatures are expanding the range of disease-carrying mosquitoes, while extreme weather events strain health services and interrupt public-health programmes.
• BUSHFIRES BURN:Several parts of Australia are facing record or near-record springtime temperatures, while dozens of fires burn across New South Wales in what theSydney Morning Heralddescribed as “a taste of the hot, dry summer ahead”.
• GOING GEOTHERMAL:The World Geothermal Congress concluded on Sunday with the launch of the Beijing Declaration, which proposed “principles and recommendations for the sustainable development of the global geothermal industry”, Chinese state-run news agencyXinhuareported.

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60

Number of countries that saw marches, rallies and other actions over 15-17 September to demand fossil fuel phase-out, according to the campaign group theGlobal Fight to End Fossil Fuels.

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Latest climate research

• Sea-level rise already delays US commuters in coastal areas by 22 minutes per year, which could increase to 200-650 minutes by 2060, according to a study inEnvironmental Research: Climate.
• A new paper inGeophysical Research Lettersshowed skill in predicting marine heatwaves in the Arabian Sea up to seven months in advance.
• Shading shallow-water coral reefs periodically can decrease light stress and slow bleaching, said new research inFrontiers in Marine Science.

(更多信息,参见碳短暂的深入日亚慱官网常总结ries of the top climate news stories onMonday,Tuesday,Wednesday,ThursdayandFriday.)

Captured

The sea ice extent around Antarctica is more than 1.5m square kilometres lower than the September average, satellite data has revealed. This extent is much smaller than has ever been measured in the austral winter, a record that goes back to 1979. “It’s so far outside anything we’ve seen, it’s almost mind-blowing,” Dr Walter Meier, senior research scientist at the US National Snow and Ice Data Center, toldBBC News. Meier is “not optimistic that the sea ice will recover to a significant degree”, the outlet added.

Spotlight

Three ways to better protect the ocean

Anew reportfrom the OSPAR Commission, which is responsible for protecting the marine environment of the north-east Atlantic, assessed the status and health of that part of the ocean and its neighbouring seas. Here, Carbon Brief unpacks three key takeaways from the report.

Climate change and ocean acidification are “driving major changes” in the north-east Atlantic.

A range of climate impacts are already being felt across the north-east Atlantic, frommarine heatwavesandsea-level riseto deoxygenation and changes in the ocean circulation. “While the root cause is global, the effects are felt at more local scales,” the report said. For example, it identified the Arctic waters as warming more rapidly than elsewhere in the region.

Local changes can have knock-on effects, it added, such as shifts in wind patterns and strength due to changes in Arctic sea-ice extent. Warming also affects ecosystems, with the report providing evidence of changes in plankton, “which, in turn, trigger changes at other trophic levels”.

Ocean acidification is also having both direct and indirect impacts on marine ecosystems in the region, “with significant negative impacts for calcareous or shelled organisms”, the report concluded.

While supporting improved ocean resilience is important, it cannot come at the expense of broader climate action, said Dr Bee Berx, one of the lead authors of the climate change assessment within the report.

She told Carbon Brief: “Reducing global warming in compliance with the UNFCCC Paris Agreement would be the main way to ensure the impacts of marine climate change and ocean acidification are minimised.”

Human pressures on marine ecosystems “reduce their resilience to climate change”.

Besides climate change, the world’s oceans face a multitude of other human impacts. Some of these pressures have eased over the past several decades.

Pollution from the oil and gas industries operating in the north-east Atlantic has waned and the amount of marine litter has diminished, despite increasing use of plastics overall. Excessive nutrient inputs from agriculture and wastewater have also decreased over much of the OSPAR region – although not everywhere.

At the same time, pressures, such as noise pollution from shipping traffic and contamination by pharmaceuticals, have increased. According to the report, such pressures weaken marine ecosystems and make them less resilient to the effects of climate change and ocean acidification.

“新兴复杂的理解teractions between cumulative pressures”, Berx told Carbon Brief. Managing those pressures will be a “critical tool for the OSPAR countries to support climate change resilience”, she added.

“Collective trends point to declining biodiversity”, despite gains for some species.

Understanding ecosystem change “is crucially important for developing effective and efficient management”, the report said. It noted that “collective trends” indicate continuing biodiversity decline and ecosystem degradation, despite measures that OSPAR countries have taken.

The report did note some bright spots for biodiversity. For example, the introduction ofinvasive alien species——一个five major drivers of biodiversity loss – to the OSPAR region has slowed.

But, at the same time, the status of most of the threatened species assessed by OSPAR was either “not good” or “unknown”. Species are harmed by both direct and indirect pressures, with localised pressures such as habitat loss exacerbated by climate change.

Watch, read, listen

THREE STRIKES:The historic labour action by the US United Auto Workers union is inextricably linked to the future of electric vehicles,Gristwrote.

PAKISTAN’S PROGNOSIS:TheThird Poleinterviewed Sherry Rehman, former climate minister of Pakistan, on the challenges her country faces under increasing uncertainty.

OLD FOREST, NEW APPROACH:Garry Merkel, a Canadian forester and a member of the Tahltan Nation, discussed holistic forest management on theYourForestpodcast.

Coming up

• 25-27 September:32nd session of the North American Forest Commission, Fredericton, Canada
• 9月26 - 28日期间:Second annual forum on environmental defenders in Latin America and the Caribbean, Panama City
• 28 September:IEA critical minerals and clean energy summit, Paris
• 30 September:Maldives presidential election(2nd round)

Pick of the jobs

• Inside Climate News,senior editor| Salary: $85,000-$100,000. Location: Remote (US)
• National Taiwan University,atmospheric sciences faculty| Salary: up to $51,000. Location: Taipei
• Global Green Growth Institute,climate finance technical officer| Salary: from $64,920. Location: Suva, Fiji
• UN Environment Programme,climate risk analyst| Salary: Unknown. Location: Santo Domingo, Dominican Republic

DeBriefedis written in rotation by Carbon Brief’s team and edited byDaisy Dunne. Please send any tips or feedback to[email protected]