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中国的气候和能源政策呈现出一种悖论:在以惊人的速度发展清洁能源的同时,也未停下新建燃煤电厂的步伐。

仅在2023年,中国就新建了70吉瓦(GW)的煤电装机容量,比2019年增长了四倍,占当年全球新增煤电装机容量的95%。

煤电产能的激增引发了人们对中国二氧化碳(CO2)排放和气候目标能否实现,以及对未来出现搁浅资产风险的担忧。

由于光伏和风能发电量不稳定,中国政府将煤炭作为保障能源安全和满足快速增长的用电高峰的手段。

与此同时,中国的电力行业在成本、需求模式、监管和市场运作方面正在发生重大变化。我们的新研究表明,用于证明新煤炭产能合理性的传统经济计算方式可能已经过时。

我们使用一个简单的分析指标来评估能满足用电高峰需求的最经济方式是什么。结果表明,光伏加电池储能的组合可能是比新建煤电更具成本效益的选择。

中国电力格局发生了怎样的变化?

在过去十年里,可再生能源和电池储能的成本大幅下降,高峰时段的住宅和商业用电需求激增,电力交易市场获得了更大的吸引力。

与此同时,中国还宣布了“双碳”目标,即在2030年前实现碳达峰、2060年前实现碳中和。鉴于这些转型,建设更多未减排的煤电厂与中国的长期气候承诺相冲突,而且对满足用电需求对增长来说,可能不再是最具成本效益的选择。它还占用了清洁能源系统转型急需的资金。

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替代指标如何评估成本?

我们的研究引入了一种替代指标,用于计算在满足不断增长的高峰用电需求的情况下,所需的最优成本投资。

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这一指标,即“净容量成本”(net capacity cost),是满足用电高峰需求所需的基础设施投资的年化固定成本,减去该设施带给电力市场的收入,或其“系统价值”(system value)。 在该指标中,负数意味着这些投资将带来利润,而非支出。

为了探索在中国使用的情境,我们使用了一个简单的例子:在一个假定省份,高峰用电需求增加了1500兆瓦(MW)、全年需求增加了6570吉瓦时(GWh)。

然后,我们概述了满足高峰和全年能源需求的五种策略(情况),其涵盖了从严重依赖煤电到光伏和电池储能相结合的方式。

在不同的案例中,资源衡量的规模基于它们能够可靠地满足高峰供应需求和年度能源需求的程度。

  • 情况1:新的煤炭发电能力可满足高峰和年度能源需求的所有增长。
  • 情况2:光伏可满足70%的年度能源需求增长,煤炭可满足30%的年度能源需求增长;光伏可满足525兆瓦的高峰供应需求(由于光伏发电可能不在高峰期间,因此基于“容量可信度”进行折减),而煤电可提供剩余的975兆瓦。
  • 情况3:光伏可满足所有年度能源需求增长;光伏和煤炭均可满足750兆瓦的高峰供应需求,同样通过容量可信度对光伏发电量进行折减。
  • 情况4:光伏满足所有年度能源需求增长;光伏和电池均为高峰供电需求提供750兆瓦;电池提供调频储备(用于管理精确至分钟的供需差异的备用电源)。
  • 情况5:光伏满足所有年度能源需求增长;广泛和电池均为高峰供电需求提供750兆瓦;电池提供能源套利(在价格或成本较低时充电,在价格或成本较高时放电)。

如下图所示,我们针对每种情况都计算了单个资源(煤、电池或光伏),以及整个系统每年获得1千瓦(kW)发电容量的年净成本,单位为人民币元。

表上半部分的资源净容量成本是指该资源的净成本(即年化固定成本减去该资源从提供能源和辅助服务,如调频,所获得的年收入)。正数表示电网运营商在增加或获取该资源时的净成本。

表下半部分的系统总净容量成本,是在每种情况下利用资源组合满足高峰需求增长的净成本。

我们用于计算系统净成本的权重是基于装机容量与高峰需求增长的比率。

不同能源组合满足用电需求的成本

情况 1 情况 2 情况 3 情况 4 情况 5
资源净容量成本 (元/千瓦/年, 每千瓦装机容量)
煤炭 424 424 512
电池 248 781
光伏 -128 -128 -128 -128
系统净容量成本 (元/千瓦/年, 每千瓦满足高峰用电需求且折减容量可信度后)
煤炭 471 306 236
电池 138 434
光伏 -223 -319 -319 -319
总计 471 83 -83 -181 115

为了对这一简单分析进行压力测试,我们研究了不同来源的各种价格的敏感性。

由于中国的光伏价格已经很低,我们的敏感性分析主要集中在煤炭、电池和其他分析所需投入的价格上。

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满足高峰用电需求最经济的方法是什么?

我们的结果表明,当电池储能提供调频储备时(情况4),光伏和储能的组合是满足高峰用电需求增长最具成本效益的选择。

在这种组合下,每获得1千瓦发电装机容量,电网运营商的成本为-181元(约-25美元或-20英镑)。

相比之下,新建煤电产能以满足高峰用电需求增长(情况1)是最昂贵的方案,每获得1千瓦装机容量的净容量成本为471元(约合65美元或52英镑)。

情况3,即大型煤电厂仅用作备用电源(几乎不发电),在中国可能出于政治原因而至少在短期内不可行。

另外两种情况(情况2和情况5)更具可比性,但鉴于自本分析报告发布以来,电池价格下降了30%以上,约为每瓦时(Wh)1元人民币(约合0.14美元或0.11英镑),因此情况5中的电池可能比情况2中的煤炭更具经济吸引力。

返回顶部

我们的解决方案如何助力中国实现气候目标?

我们的分析表明,为了应对不断变化的形势,在满足中国日益增长的能源需求的同时,实现其气候目标的近期战略是将电池储能纳入电力市场。

目前,中国政府允许包括电池在内的“新型储能”参与电力市场。然而,详细规定尚不明确,电池的参与可以更简单。

例如,电池储能不被允许提供“运转储备”,即为应对意外的供需误差所预留的发电量。如果允许电池储能提供运转储备,将增强其商业价值。

允许电池储能更多地参与市场将促进电池储能系统的持续创新和降低成本,同时为系统运营商提供宝贵的运营经验。

这种策略将与市场效益相符,并反映美国和欧洲近期的电力市场经验。

这也将有助于解决近期的产能和能源需求,因为电池和光伏发电通常比燃煤电厂的建设速度更快。

此外,它还有助于缓解未来新增燃煤发电与可再生能源之间的冲突。主要作为可再生能源发电备用电源的新建燃煤电厂要么很少运营,要么侵占了其他现有煤炭发电厂的运营时间和净收入,从而产生新搁浅资产的风险。

通过继续进行电力市场改革,也将促进对可再生能源发电和电力储存进行更有效的投资。

允许市场制定批发市场电价、允许可再生能源发电和电力储存参与批发市场,这可以提高其收入和利润。

此外,改革还将鼓励高效利用储能,这是我们的关键发现。储能可以为电力系统提供多种功能;批发电价有助于引导储能运营以最低的成本实现具有最高价值的功能。

中国国家能源局最近发出指令,要求将新型储能设施(非抽水蓄能)纳入电网调度运行,这是向我们概述的改革迈出的一步。

可能需要进一步确定适当的补偿机制,例如在某些省份对此类储能设施提供的所有服务进行容量补偿,以促进这些储能设施的可持续发展和并网。

最后,仅靠增加供应不太可能成为满足中国电力需求增长的最低成本方式。提高终端使用效率和“需求响应”也有助于降低供电的总体成本。

随着中国电力市场改革的不断深入,连接多个省份的区域市场设计,以及鼓励省份间资源共享的区域资源充裕性规划,也有助于以最具成本效益和最低碳的方式满足中国不断增长的用电量和高峰需求。

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The post 嘉宾来稿:满足中国增长的用电需求 光伏加储能“比新建煤电更实惠” appeared first on Carbon Brief.

嘉宾来稿:满足中国增长的用电需求 光伏加储能“比新建煤电更实惠”

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DeBriefed 24 October 2025:  EU 2040 climate goal progress; Shipping industry carbon price delayed; Europe’s indigenous people take Finland to court

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Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.

This week

EU leaders agreed climate goal ‘truce’

‘BREAKTHROUGH’: EU leaders have reached a “breakthrough” on climate issues that “increases the likelihood” that the bloc will be able to sign off on its 2040 climate goal before COP30 in November, reported Bloomberg. Leaders reached a “truce” after agreeing to a raft of “enabling conditions”, designed to support carmakers and other energy-intensive industries through a “green transition”, it added.

‘COMPETING GOALS’: Reuters reported that leaders agreed “to proceed with the 2040 target, but [to] leave details for ministers to approve at a 4 November meeting”. It added that the European Commission had “promised to amend some climate measures” to win support from member states, including “controlling” carbon prices in the upcoming market for heat and transport fuels. France24 noted that leaders discussed how to manage the bloc’s “competing goals” of supporting business while playing a “lead role in the climate fight”.

Shipping industry delayed carbon price

NEGOTIATIONS COLLAPSE: Just hours after the previous issue of DeBriefed was published, member states of the UN’s International Maritime Organization agreed to delay a vote on whether to formally adopt a global carbon price for shipping by a year, reported the National. It said the negotiations “collapsed under US pressure”, meaning they were unable to finalise a deal agreed in April that would have “made shipping the first global industry subject to a carbon pricing system”. [Carbon Brief covered the deal and what it would have meant for shipping emissions at the time.]

‘MAJOR VICTORY’: The Financial Times described the delay as a “major victory” for US president Donald Trump’s “campaign to block a climate agreement for the global shipping industry” and “part of the wider Trump administration drive to sell more of its oil, coal and gas”. According to Agence France-Presse, the UN called the delay a “missed opportunity” and the European Commission said it was “regrettable”

‘REGRETABLE DERAILMENT’: A Financial Times editorial said the outcome was a “regrettable derailment” and “one of Trump’s most successful attempts yet to force all countries, rich and poor, to back his push to prolong the era of fossil fuels”. Elsewhere, US secretary of state Marco Rubio wrote a letter to the Wall Street Journal, outlining how the administration had “thwarted the UN’s tax”, dubbing the delay a “diplomatic victory” for the US. 

Around the world

  • DISASTER ALERTS: A new report from the UN’s World Meteorological Organization has called for a worldwide disaster alerts system as extreme weather events are leaving millions of people vulnerable, reported Al Jazeera
  • FOREST FUND: The World Bank has agreed to host the Tropical Forest Forever Fund (TFFF), being pushed by the Brazilian COP30 presidency Brazil, according to Folha de São Paulo. Separately, the country’s state-owned oil company Petrobras has been granted permission to drill for oil near the mouth of the Amazon, reported the Guardian
  • ‘GREEN JOBS’: The UK government announced a national clean-energy jobs plan, designed to “create…an extra 400,000 green jobs” in the next five years, the Guardian said. Meanwhile, UK prime minister Keir Starmer made a “last-minute decision” to attend COP30 in Brazil in November, the Financial Times reported. 
  • ‘BEAUTIFUL CHINA’: After a meeting in Beijing, top Chinese policymakers have listed “building a Beautiful China” as a “primary objective” for the 15th five-year plan covering 2026-2030, said International Energy Net. The concept, described in Carbon Brief’s glossary, covers tackling pollution and meeting China’s carbon neutrality targets..

$101bn 

The record-high cost of “climate disasters” in the US in the first half of 2025, according to new research from the Climate Central group reported by the Guardian


Latest climate research

  • Between 1997 and 2021, Antarctic ice shelves saw a decrease in “damaged area” | Nature Climate Change
  • Reducing food waste and dietary shifts could help halve emissions related to meat consumption in US cities | Nature Climate Change
  • In an “overshoot” scenario, where the world temporarily passes 1.5C of warming, permafrost area may “effectively recover” once temperatures fall, but carbon losses will be “largely irreversible” | Earth System Dynamics

(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

Captured

More forest is being lost than gained around the world each year

The amount of forest being lost around the world has reduced by millions of hectares each year in recent decades, Carbon Brief reported, based on the Global Forest Resources Assessment from the UN’s Food and Agriculture Organization. The report found that an estimated 10.9m hectares (Mha) of land was deforested each year between 2015 and 2025, nearly 7Mha less than the annual loss over 1990-2000. However, as the map above shows, more forest is still lost than gained each year. Between 2015 and 2025, there was an average 6.8Mha of forest growth each year, but 10.9Mha of loss. 

Spotlight

The Sámi people take Finland to court

This week, Carbon Brief reports on the launch of a “landmark” legal claim by the Indigenous Sámi people against the government of Finland, focused on the interplay between climate change and cultural traditions.

In June, 33 members of the Muddusjärvi Reindeer Herders’ Cooperative (MPLK), a Sámi community in northern Finland, brought a legal complaint to the UN human rights committee in Geneva. 

It alleged that the Finnish government had allowed multiple breaches of the International Covenant on Civil and Political Rights (ICCPR), which sets out the right to enjoy one’s culture, family life, non-discrimination and self-determination.

The MPLK has practised “nature-based Sámi reindeer herding” for centuries in Finland, as part of one of three remaining herding communities that use the endangered Inari Sámi language. The Sámi are the only Indigenous people recognised in Europe.

A Reindeer Rangifer tarandus in the snow in Finnish Laplan.
A Reindeer Rangifer tarandus in the snow in Finnish Laplan. Credit: Richard Tadman / Alamy Stock Photo

Changing conditions

Within its complaint, the MPLK  said it is being dispossessed from land traditionally used for reindeer herding, as a result of climate change and decades of intensive logging by the Finnish state-owned forestry agency Metsähallitus. These have “severely damaged” the land they depend on, the group’s lawyers Hogan Lovells said. 

In particular, the loss of lichen-rich, old-growth forests and changes to snow conditions have made it harder for reindeer to access natural food sources, creating an “existential threat” that “places in jeopardy the viability of the MPLK community’s way of life”, according to the complaint.

While there are additional funds provided by the Finnish government to compensate reindeer herders during harsh winters, this does not go far enough, the MPLK argued. For example, herders lost €32m between 2019 and 2020, but the MPLK only received €6m in compensation. 

There have already been a number of lawsuits brought by the Sámi people across the Nordic countries, in an effort to protect their lands and traditions. 

This includes the Norwegian government having to pay out millions to Sámi reindeer herders, an ongoing case in Sweden and two UN committees finding that Finland had violated Sámi rights to culture and land through mineral exploration permits on their territory. 

A new precedent

For the MPLK case, Hogan Lovells are relying on a precedent set at the committee in 2022 in a case brought by an indigenous group in Australia, whereby the government was ordered to compensate Torres Straits islanders who argued that climate change had a direct harmful consequence on their livelihood, culture and traditional ways of life. 

Finnish human rights law professor and human rights practitioner Martin Scheinin was involved in that case and is now co-counsel for the MPLK complaint. He told Carbon Brief that he had been “thrilled” by the 2022 outcome:  

“The [UN committee] broke [a] new path by focusing on Australia’s adaptation obligations as positive human rights obligations. As the committee also established that the right of minorities and Indigenous peoples to enjoy their own culture includes the right to transmit a distinctive way of life to new and even future generations, it was natural that the Indigenous Sámi people in Finland…want to build upon all these elements in their own case before the same committee.”

A formal response from the Finnish government to the complaint is expected this month. 

Watch, read, listen

INDONESIA’S ‘ENERGY PARADOX’: A new episode of the China-Global South Podcast discussed how China sits at the heart of Indonesia’s “energy paradox”. 

‘RARE-EARTHS TRAP’: Simon Nixon, former chief leader writer for the Times, wrote on his Substack about how the “west lost” to China, after the country “spent decades laying its rare-earths trap”. 

ANIMAL OBSTRUCTION: The latest episode of the Drilled podcast discussed how the animal agriculture industry has – and still does – “obstruct…climate policy”. 

Coming up

Pick of the jobs

DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.

This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.

The post DeBriefed 24 October 2025:  EU 2040 climate goal progress; Shipping industry carbon price delayed; Europe’s indigenous people take Finland to court appeared first on Carbon Brief.

DeBriefed 24 October 2025:  EU 2040 climate goal progress; Shipping industry carbon price delayed; Europe’s indigenous people take Finland to court

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UN report: Five charts showing how global deforestation is declining

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The amount of forest lost around the world has reduced by millions of hectares each year in recent decades, but countries are still off track to meet “important” deforestation targets.

These are the findings of the Global Forest Resources Assessment – a major new report from the UN’s Food and Agriculture Organization – which says that an estimated 10.9m hectares (Mha) of land was deforested each year between 2015 and 2025.

This is almost 7Mha less than the amount of annual forest loss over 1990-2000.

Since 1990, the area of forest destroyed each year has halved in South America, although it still remains the region with the highest amount of deforestation.

Europe was the only region in the world where annual forest loss has increased since 1990.

Agriculture has historically been the leading cause of deforestation around the world, but the report notes that wildfires, climate change-fuelled extreme weather, insects and diseases increasingly pose a threat. 

The Global Forest Resources Assessment is published every five years. The 2025 report compiles and analyses national forest data from almost every country in the world over 1990-2025.

Carbon Brief has picked out five key findings from the report around deforestation, carbon storage and the amount of forest held within protected areas around the world.

1. Rates of deforestation are declining around the world


Rates of annual deforestation, in thousands of hectares, in South America, Asia, Africa, North and Central America, Oceania and Europe over 1990-2000 (dark blue), 2000-15 (medium blue) and 2015-25 (light blue). Source: Global Forest Resources Assessment 2025

In total, around 489Mha of forest have been lost due to deforestation since 1990, the new report finds. Most of this – 88% – occurred in the tropics.

This breaks down to around 10.9Mha of forest lost each year between 2015 and 2025, a reduction compared to 13.6Mha of loss over 2000-15 and 17.6Mha over 1990-2000.

Deforestation refers to the clearing of a forest, typically to repurpose the land for agriculture or use the trees for wood. 

The chart above shows that South America experiences the most forest loss each year, although annual deforestation levels have halved from 8.2Mha over 1990-2000 to 4.2Mha over 2015-25.

Annual deforestation in Asia also saw a sizable reduction, from 3.9Mha over 1990-2000 to 2Mha over 2015-25, the report says.

Europe had the lowest overall deforestation rates, but was also the only region to record an increase over the last 35 years, with deforestation rates growing from 126,000 hectares over 1990-2000 to 145,000 hectares in the past 10 years.

Despite the downward global trend, FAO chief Dr Qu Dongyu notes in the report’s foreword that the “world is not on track to meet important global forest targets”. 

In 2021, more than 100 countries pledged to halt and reverse global deforestation by 2030. But deforestation rates in 2024 were 63% higher than the trajectory needed to meet this 2030 target, according to a recent report from civil society groups.

The goals of this pledge were formally recognised in a key text at the COP28 climate summit in Dubai in 2023, which “emphasise[d]” that halting and reversing deforestation and forest degradation by 2030 would be key to meeting climate goals. 

2. Global net forest loss has more than halved since 1990


Forest area net change by country between 1990 and 2025, in hectares. Source: Global Forest Resources Assessment 2025 

The new report finds that forests cover more than 4bn hectares of land, an area encompassing one-third of the planet’s land surface.

More than half of the world’s forested area is located in just five countries: Russia, Brazil, Canada, the US and China.

The map above shows that, overall, more forest is lost than gained each year around the world. There was 6.8Mha of forest growth over 2015-25, but 10.9Mha of forest lost.

The annual rate of this global net forest loss – the amount that deforestation has exceeded the amount regrown – has more than halved since 1990, dropping from 10.7Mha over 1990-2000 to 4.1Mha over 2015-25.

The report says this change was due to reduced deforestation in some countries and increased forest expansion in others. However, the rate of forest expansion has also slowed over time – from 9.9Mha per year in 2000-15 to 6.8Mha per year in 2015-25.

There are many driving factors behind continuing deforestation. Agriculture has historically been the leading cause of forest loss, but wildfire is increasingly posing a threat. Wildfires were the leading driver of tropical forest loss in 2024 for the first time on record, a Global Forest Watch report found earlier this year. 

The new UN report says that an average of 261Mha of land was burned by fire each year over 2007-19. Around half of this area was forest. Around 80% of the forested land impacted by fires in 2019 was in the subtropics – areas located just outside tropical regions, such as parts of Argentina, the US and Australia.

The report notes that fire is widely used in land management practices, but uncontrolled fires can have “major negative impacts on people, ecosystems and climate”. 

It adds that researchers gathered information on fires up as far as 2023, but chose to focus on 2007-19 due to a lack of more recent data for some countries. 

A different report from an international team of scientists recently found that fires burned at least 370Mha of land – an area larger than India – between March 2024 and February 2025. 

3. Many countries are hugely increasing their forest area


Top 10 countries for annual net gain (blue) and net loss (red) of forest area over 2015-25, in 1,000 hectares per year. Source: Global Forest Resources Assessment 2025

Globally, deforestation is declining, but the trend varies from country to country.

The chart above shows that some nations, such as China and Russia, added a lot more forest cover than they removed in the past decade through, for example, afforestation programmes.

But in other countries – particularly Brazil – the level of deforestation far surpasses the amount of forest re-grown.

Deforestation in Brazil dropped by almost one-third between 2023 and 2024, news outlet Brasil de Fato reported earlier this year, which was during the time Luiz Inácio Lula da Silva took over as president. The new UN report finds that, on average, Brazil lost 2.9Mha of forest area each year over 2015-25, compared to 5.8Mha over 1990-2000. 

Russia’s net gain of forest cover increased significantly since 1990 – growing from 80,400ha per year in 1990-2000 to 942,000ha per year in 2015-25.

In China, although it is also planting significant levels of forest, the forest level gained has dropped over time, from 2.2Mha per year in 2000-15 to 1.7Mha per year in 2015-25.

Levels of net forest gain in Canada also fell from 513,000ha per year in 2000-15 to 82,500ha per year in 2015-25.

In the US, the net forest growth trend reversed over the past decade – from 437,000ha per year of gain in 2000-15 to a net forest loss of 120,000ha per year from 2015 to 2025.

Oceania reversed a previously negative trend to gain 140,000ha of forests per year in the past decade, the report says. This was mainly due to changes in Australia, where previous losses of tens of thousands of hectares each year turned into an annual net gain of 105,000ha each year by 2015-25.

4. The world’s forests hold more than 700bn tonnes of carbon


Changes in forest carbon stock by region and subregion of the world over 1990-2025. Source: Global Forest Resources Assessment 2025

The “carbon stock” of a forest refers to how much carbon is stored in its trees and soils. Forests are among the planet’s major carbon sinks.

The new report estimates that forests stored an estimated 714bn tonnes, or gigatonnes, of carbon (GtC) in 2025.

Europe (including Russia) and the Americas account for two-thirds of the world’s total forest carbon storage.

The global forest carbon stock decreased from 716GtC to 706GtC between 1990 and 2000, before growing slightly again by 2025. The report mainly attributes this recent increase to forest growth in Asia and Europe.

The report notes that the total amount of carbon stored in forests has remained largely static over the past 35 years, but with some regional differences, as highlighted in the chart above.

The amount of carbon stored in forests across east Asia, Europe and North America is “significantly higher” now due to expanded forest areas, but it is lower in South America, Africa and Central America.

Several studies have shown that there are limitations on the ability of forests to keep absorbing CO2, with difficulties posed by hotter, drier weather fuelled by climate change.

A 2024 study found that record heat in 2023 negatively impacted the ability of land and ocean sinks to absorb carbon – and that the global land sink was at its weakest since 2003. 

Another study, published in 2022, said that drying and warming as a result of deforestation reduces the carbon storage ability of tropical forests, especially in the Congo basin and the Amazon rainforest. 

5. Around one-fifth of the world’s forests are located in protected areas


The percentage of forest land in Asia, Africa, Europe, South America, Oceania and North and Central America contained inside protected areas (dark blue) and outside protected areas (light blue) in 2025. Source: Global Forest Resources Assessment 2025

The amount of forested land located in protected areas increased across all regions between 1990 and 2025.

For an area to be considered “protected”, it must be managed in a way that conserves nature.  

Around 20% of the world’s forests are located in these protected areas, the new report finds, which amounts to 813Mha of land – an area almost the size of Brazil.

Nearly every country in the world has pledged to protect 30% of the Earth’s land and sea by 2030. However, more than half of countries have not committed to this target on a national basis, Carbon Brief analysis showed earlier this year. 

Almost 18% of land and around 8% of the ocean are currently in protected areas, a UN report found last year. The level is increasing, the report said, but considerable progress is still needed to reach the 2030 goal. 

The new UN report notes that Europe, including Russia, holds 235Mha of protected forest area, which is the largest of any region and accounts for 23% of the continent’s total forested land.

As highlighted in the chart above, 26% of all forests in Asia are protected, which is the highest of any region. The report notes that this is largely due to a vast amount of protected forested land in Indonesia. 

Three countries and one island territory reported that upwards of 90% of their forests are protected – Norfolk Island, Saudi Arabia, Cook Islands and Uzbekistan.

The post UN report: Five charts showing how global deforestation is declining appeared first on Carbon Brief.

UN report: Five charts showing how global deforestation is declining

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Greenhouse Gases

Rapid emissions cuts would avoid 64cm of ‘locked in’ sea level rise by 2300

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Cutting emissions in line with the 1.5C warming limit, rather than following current climate policies, could curb long-term sea level rise by 64cm, a new study says.

The research, published in Nature Climate Change, projects how much sea level rise will be unavoidable – or “locked in” – by the year 2300, due to emissions over the coming decades.

According to the authors, 29cm of global average sea level rise is already in the pipeline due to the emissions that were released up to the year 2020.

Following current climate policies until the year 2090 will “lock in” an additional 79cm of sea level rise for the year 2300, the study finds.

However, reducing emissions in line with 1.5C would cut this additional sea level rise to 15cm.

The analysis shows that “if we reduce emissions rapidly in the coming decades, there is a clear path to limiting the legacy of sea level rise”, the lead author of the study tells Carbon Brief.

The study also explores regional sea level rise, showing that Pacific small-island nations will face some of the highest rates of sea level rise.

A scientist not involved in the research tells Carbon Brief that the paper “exposes a deep inequity” between nations, arguing that this makes “ambitious” action to cut greenhouse gas emissions “not just a climate necessity, but a climate-justice imperative”.

‘Locked in’

Average global sea level has risen by more than 20cm since 1900, driven mainly by human-caused climate change through thermal expansion of the ocean and the melting of glaciers and ice sheets.

Rising seas are already threatening to wipe out small-island nations, jeopardising the security, livelihoods and cultures of people who live in these areas. Meanwhile, coastal regions around the world are facing more frequent flooding, erosion and saltwater intrusion.

The authors of the new study explain that emissions released over the coming decades will affect global sea levels for hundreds of years. This is because the oceans and ice sheets respond slowly to past and present warming, they note.

The authors call this “locked in” or “committed” sea level rise.

The study explains that sea level projections are generally based on 21st century emissions pathways, but notes that “late-century emissions then dominate the longer-term sea-level response and mask the impact of near-term emissions”.

In contrast, this study assesses the impact of emissions both early and late in the 21st century – including past emissions and those projected to occur under different emissions pathways. The research investigates how much sea level rise will be locked in by the year 2300 through these emissions.

According to the authors, 29cm of global average sea level rise, compared to 1995-2014, is already locked in due to the emissions that were released up to the year 2020.

Rising seas

The study uses emulators – simple climate models with lower time and computational costs than full-scale Earth system models – to model how much sea level rise will be locked in by 2300 due to 21st century emissions.

The authors chose five emissions pathways and ran multiple model runs where they simulated sudden stops in emissions at the end of each decade for each pathway. This allowed them to isolate the emissions just until these dates.

For example, modelling a sudden drop in emissions in the year 2050 allows the authors to calculate how much sea level rise over the next two centuries is driven solely by human-caused emissions released over the next two decades.

The authors use five emissions pathways:

  • SSP1-1.9: A very-low emissions reductions pathway “consistent with” the Paris Agreement’s 1.5C limit
  • SSP1-2.6: A “low” emissions pathway consistent with 2C of warming
  • SSP2-4.5: A “current climate policy-like trajectory”
  • SSP3-7.0: A “high” emissions pathway
  • SSP5-8.5: A “very-high emissions” pathway

The left-most panel shows how much additional sea level rise is locked in for the year 2300 due to emissions produced between 2020 and 2030. The next three panels show the results for emissions produced between 2020 and 2050, 2070 and 2090, respectively.

The plot shows that higher levels of greenhouse gas emissions lock in more sea level rise for the year 2300.

Global average sea level rise commitment under the SSP1-1.9 (light blue), SSP1-2.6 (dark blue), SSP2-4.5 (yellow), SSP3-7.0 (red) and SSP5-8.5 (dark red) pathways, due to emissions between 2020 and 2030 (left), 2050 (middle left), 2070 (middle right) and 2090 (right). Source: Nauels et al (2025).

The authors find that, under the SSP2-4.5 “current climate policies” scenario, human-produced greenhouse gas emissions over 2020-50 will lock in an additional 29cm of sea level rise by the year 2300. This number grows to 79cm when including emissions out to 2090 under this scenario.

Meanwhile, under the scenario consistent with the 1.5C limit, only 15cm of additional sea level rise will be locked in by 2090.

This means that efforts to cut greenhouse gas emissions over the coming decades could curb long-term sea level rise by an extra 64cm.

The study authors say that their results “reinforce how every increment of additional peak warming from cumulative emissions irreversibly increases sea level rise”.

Dr Alexander Nauels is a science adviser at Climate Analytics and lead author on the study. He tells Carbon Brief that the world is “already committed to a really substantive amount of sea level rise” and stresses that this must be considered in terms of “adaptation, planning and risk management”.

However, he adds, “if we reduce emissions rapidly in the coming decades, there is a clear path to limiting the legacy of sea level rise that we would produce in the coming decades”.

Dr Catia Domingues, is a researcher at the UK’s National Oceanography Centre and was not involved in the study. She tells Carbon Brief that the study’s methodology is “clever and necessary”. She adds:

“[The study] clearly shows how the emissions from just the next 30 years, under current climate policies, will write an irreversible chapter for centuries to come, locking in significant sea level rise on their own.”

Warming levels

The authors also calculate the committed sea level rise at different warming levels.

The chart below plots sea level rise against warming level for every scenario and time period used in the study. It highlights how higher levels of warming commit the world to ever higher seas.

Committed sea level rise by 2300 at different warming levels, under SSP1-1.9 (light blue), SSP1-2.6 (dark blue), SSP2-4.5 (yellow), SSP3-7.0 (red) and SSP5-8.5 (dark red) pathways. Circles, X’s, squares and crosses indicate data points for 2030, 2050, 2070 and 2090 respectively. The green and blue lines show the 1.5C and 2C temperature thresholds. Source: Nauels et al (2025).

The authors note that the relationship between global temperature and committed sea level rise to 2300 is not “linear”, noting that the amount of sea level rise that is locked in by warming accelerates as global temperatures rise.

The authors explain that this is due to a “non-linear increase in ice mass loss in a warmer world” – in other words, physical feedbacks mean that higher levels of warming could see disproportionately large increases in ice losses.

Nauels tells Carbon Brief many sea level processes, such as ice-sheet responses, are still not “fully understood”. This means that when looking out to 2300, there can be “large uncertainties” in results, he adds.

Nevertheless, he argues that it is “still very important to explore the longer-term sea level response, because of the huge risk that is attached to it”.

Inequity

The main findings of the study focus on global average sea level rise. However, the authors note that sea level rise is not consistent across the world, with some regions facing faster rates of sea level rise than others.

This is largely due to ocean currents, driven by wind, warming, evaporation and rainfall, which push large masses of water around the planet. It is also caused by the bumpy, non-uniform surface of the earth.

To show these differences, the authors also selected a handful of coastal regions to study.

Nauels tells Carbon Brief that the study authors decided to focus on a handful of regions that “diverge” from the average global trend.

For example, they find that Pago Pago – the capital of American Samoa, which is made up of a string of coastal villages – will experience greater committed sea level rise than the global average.

On the other hand, Oslo is experiencing “land uplift” and actually shows a drop in sea level under the lowest warming scenario.

The NOC’s Domingues tells Carbon Brief that the study “exposes a deep inequity” between nations. She adds:

“This makes ambitious mitigation not just a climate necessity, but a climate-justice imperative.”

The post Rapid emissions cuts would avoid 64cm of ‘locked in’ sea level rise by 2300 appeared first on Carbon Brief.

Rapid emissions cuts would avoid 64cm of ‘locked in’ sea level rise by 2300

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