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新研究显示,中国来自农业机械的碳排放快速增长,可能会“阻碍”该国实现净零排放的目标。

这项发表在《自然-食品》(Nature Food)期刊上的研究发现,自1985年以来,中国农业机械CO2(二氧化碳)排放量增加了大约七倍。

研究人员利用政府发布的不同时期农机数量统计数据,计算了1985年至2020年期间CO2排放量及其他空气污染物的变化。

他们发现,自1985年以来,农业机械的CO2排放量平均每年增长近6%。

研究指出,按照中国实现2060年净零排放目标的路径,若农业机械化程度按“预期趋势”继续提升,其相关排放在2050年可能占中国总排放量的21%。

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作者表示,这可能会使中国实现减排目标更加困难,并导致空气质量“恶化”。

然而,研究还发现,如果广泛采用由可再生能源驱动的农业机械,有望减少65%至70%的相关排放。

一位未参与该研究的专家对Carbon Brief表示,尽管该研究“具有价值”,但农业机械不太可能在总排放量中占到如此高的比例。

“如果中国在减少其他排放源方面取得了快速进展……那么我预计在农业机械的脱碳方面也会取得显著成效。”她说。

农机相关排放

粮食系统大约占人类温室气体排放的三分之一。

这一数字涵盖了与粮食生产相关的所有排放——从因森林砍伐或土地使用变化导致的排放,到奶牛打嗝或粪便释放的甲烷。

这项新研究的数据来自《中国统计年鉴》,后者提供了各种社会经济指标的年度统计数据。研究者从中提取了中国农业机械的数量与功率、机械所用的燃料属性、耕地面积、人口等信息。

除了CO2排放量外,研究者还计算了三种与农业机械相关的空气污染物排放量:PM2.5(细颗粒物)、NOx(氮氧化物)和THC(总烃)。

研究者将农业机械分为四类:小型拖拉机、大型拖拉机、田间管理机械和收割机械。然后,他们计算了每类机械在每一年的CO2、PM2.5、NOx和THC排放量。

下图展示了1985年至2020年研究期间的CO2排放量。图中柱状表示不同类型农业机械的排放量:收割机械(浅蓝色)、田间管理机械(粉色)、小型拖拉机(浅绿色)和大型拖拉机(深绿色)。

Annual emissions of CO2 from farm machinery over 1985-2020. The colours indicate the type of machinery responsible for the emissions: small tractors (light green), large tractors (dark green), field-management machinery (pink) and harvesting machinery (light blue). Source: Zhuang et al. (2025)

他们发现,农业机械CO2排放总量已从1985年的约23MtCO2(1MtCO2=百万吨二氧化碳),增长到2020年的近160MtCO2,年均增长率为5.7%。

这相当于2020年中国总排放量的约1.5%。虽然比例不高,但作者指出,这一排放量实际上超过了部分国家的年排放总量,如荷兰、菲律宾和尼日利亚。

尤其是,大型拖拉机所带来的排放量自2005年以来平稳增长,作者将此归因于“一系列推动大型机械化的政策”。

未参与该研究的中山大学教授覃章才表示,该研究将农业机械排放从更广泛的食品系统中拆分出来“提供了独特的视角”。覃教授表示,该做法“使政策制定者能够在不影响农业生产力的情况下,设计有针对性的干预措施”。

区域分布

研究者还将排放数据细化到省级层面,发现不同地区农业机械排放量差异很大。排放量最低省份仅有约0.1MtCO2,而排放最高的省份则达到17.5MtCO2。

他们发现,中国东部和东北的五个省份——山东、河南、黑龙江、河北和安徽,占农业机械排放总量的40%以上。这些省份合计拥有全国三分之一的耕地面积和约46%的农机总动力。

然而,即使在这些高排放地区之间,机械类型的构成也存在差异,有些省份更依赖大型拖拉机,有些则以田间管理机械为主。

未参与该研究的《Our World in Data》副主编汉娜·里奇(Hannah Ritchie)博士表示,这种次国家级排放分析是该研究的关键进展之一。

里奇博士解释说:“这种排放估算的空间分辨率极具价值,因为在中国这样幅员辽阔的国家,各地排放差异显著。它还为未来在不同机械化程度和低碳技术采纳率下的潜在排放路径,提供了重要的洞见。”

增长因素

研究人员确定了四个推动排放增加的社会经济因素:人口增长、人均耕地面积变化、机械化水平以及排放强度。

下图展示了由排放强度(深蓝色)、机械化水平(浅蓝色)、人均耕地面积(黄色)和人口(橙色)的变化所导致的CO2排放量变化(黑色)。

Total CO2 emissions (black) for the years 1985, 2000, 2010 and 2020. The emissions are broken down by four contributing factors: changes in emission intensity (dark blue), level of mechanisation (light blue), per-capita cropland area (yellow) and population (orange). Source: Zhuang et al. (2025)

论文指出,在这些因素中,机械化水平的提升“主导”了排放变化。仅这些变化就导致1985年至2000年间排放量增加了约100%。

研究指出,人口增长也是研究区间早期农业机械排放量增长的重要驱动力,但自2000年以来,这一因素的影响有所减弱。

相比之下,作者指出,排放强度的上升总体上反而促使排放减少;而“耕作压力”在研究初期推动了排放上升,但自2000年起则转而起到抑制排放的作用。

碳排放目标

作者指出,根据现行政策,中国致力于“到2035年主要农作物生产实现全过程机械化”。

因此,他们警告称,若农业机械化持续增长且未加遏制,可能会对中国实现“双碳”目标构成挑战。(“双碳”目标指的是中国承诺在2030年前实现碳达峰,并在2060年前实现碳中和。)

作者指出,有效减排需在短期和长期分别采取不同策略,并强调从短期可用性来看,“生物燃料和天然气将在未来十年发挥重要作用”。

作者还认为,从长远来看,可再生能源以及绿氢“具有最大的减排潜力”。

此前研究表明,使用自动化设备、电动拖拉机和可再生能源可以减少90%的农业排放。

里奇表示,她“对农业机械的相对(排放量占比)在2050年能达到20%持一定怀疑态度”。

她补充道:“这基于一个假设,即这些排放大多不会减少,而其他大多数行业排放迅速下降。但如果中国在减少其他排放源,包括卡车等更大型的道路运输排放和其他农业排放方面取得快速进展……那么我预计在农业机械的脱碳方面也会取得显著成效。”

The post 中国农机排放量上升或“阻碍”净零目标实现 appeared first on Carbon Brief.

https://www.carbonbrief.org/translations-rising-emissions-from-farm-equipment-could-hinder-chinas-net-zero-goals/

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Pawa in Palau

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This week our powerful Pacific team is in Palau for the Pacific Islands Forum Leaders Meeting. This is a major moment in our campaigns for Pacific climate justice and to stop deep sea mining. So what’s it all about, what can we expect over the coming days, and why is this year’s meeting in particular so important? Read on to find out!

*Pawa is Melanesian word meaning collective power.

Meet Moemoana Schwenke, our Pacific Climate Campaigner

“When you love something deeply, you do everything you can to protect it.”

@greenpeaceap

For us in the Pacific, protecting our home is an expression of love. Follow our journey across the Pacific all the way to COP31 in Türkiye. Pacific voices continue to lead the call for climate justice champion our priorities and build a movement for a Fossil Fuel Free Pacific, from our islands to the world. Join the movement and follow the journey. @Moemoana Schwenke

♬ original sound – Greenpeace Australia Pacific

What is the Pacific Islands Forum (PIF)?

The Pacific Islands Forum, or ‘PIF’, is our region’s most important political organisation. It is where countries of the Pacific — including Australia and New Zealand — come together to collaborate on shared challenges and to set collective goals.

The PIF Leaders Meeting is an annual weeklong event that includes a dedicated meeting of the Pacific’s small island developing states (PSIDS), many special side events organised by Pacific civil society, the leaders’ meeting itself, and more. At the end of the week, leaders issue a Forum Communiqué, capturing what they have agreed on, their shared priorities and the actions they will take together.

This year’s meeting is being held in the beautiful northern Pacific nation of Palau, the same place our Pacific team gathered back in January to plan for the year.

Islands in Palau
© Hector John Periquin

What’s at stake this year?

Climate change has dominated the PIF for decades. Pacific leaders have been crystal clear it is their number one priority, and the annual gathering is the moment they can exert maximum pressure on Australia over its fossil fuel record.

The voyage to COP31

This year’s meeting comes less than three months before COP31, where Australia will take on the role of President of Negotiations — a role it has committed to undertaking in partnership with the Pacific — and less than a month before the ‘Pacific Pre-COP’, to be held in Fiji and Tuvalu.

Following a fraught round of mid-year negotiations in Bonn, PIF leaders will need to set out a clear vision and priorities for COP31. These include accelerating a just global transition away from fossil fuels, defending science as the foundation of international climate cooperation, and increasing the availability and accessibility of finance for renewable energy and climate adaptation.

Pictured left to right - 
- Dr Simon Bradshaw, COP31 Lead and report author, Greenpeace Australia Pacific
-Belyndar Rikimani, Campaigns and Research Lead, Pacific Islands Students Fighting Climate Change
-Shiva Gounden, Head of Pacific, Greenpeace Australia Pacific
© Greenpeace / Marie Jacquemin

Accountability for Australian fossil fuel exports

Since the last PIF Leaders Meeting, Australia has signed the Belém Declaration on the Transition Away from Fossil Fuels. The declaration reaffirmed the legally binding commitment to help limit global warming to 1.5°C and recognised that this is incompatible with new fossil fuel production. Yet, Australia has continued to approve new coal and gas projects, including at least five since the last PIF Leaders Meeting.

Barry Dick observes the community graveyard impacted by coastal erosion on Pele Island in Vanuatu.
© Niki Kuautonga / Greenpeace

What is Greenpeace doing?

We’re going big this year, taking six members of our team to Palau to support Pacific leaders to hold the line, hold Australia accountable, and show the world what’s at stake. We’ll lobby leaders, hold press conferences, share our messages with the world, and support our incredible local partners in Palau.

Members of the Greenpeace Pacific team at the Pacific Islands Forum leaders' meeting in Palau, 2026.

How can you get involved?

PIF is the first in a drumbeat of major moments where we’ll be carrying the voices of the Pacific to the world. Come October we’ll be voyaging to Fiji on our ship Oceania for the Pacific Pre-COP, and in November we’ll be off to Antalya for the world’s climate negotiations (COP31).

Learn more about the Pacific way to a fossil fuel free future by checking out our report and exhibition.

Follow our journey, and check back here for more ways to join the movement for climate justice. Together we have the pawa!

Pawa in Palau

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Climate Change

From firefighting to future-proofing: Preventing wildfires must be the priority

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Gill Einhorn is head of the Forest Future Alliance and Natalie Çilem is community lead of the Global Wildfire Leadership Network.

Wildfires have devastated communities across the world this summer, claiming lives, displacing thousands of people and leaving billions in economic damage in their wake. In Europe alone, wildfires have already caused an estimated €19 billion in losses this year.

They are an economic, financial and public health challenge that is growing faster than many governments and markets are prepared for – and exposing the real costs of poor land management.

A system built for recovery, not resilience

Far more money is currently spent responding to the disastrous effects of wildfires than preventing them in the first place. The United Nations Environment Programme estimates that more than half of wildfire-related spending goes towards response, while planning receives only around 0.2 percent. This problem is not limited to wildfires; over 95 percent of disaster aid between 2005 and 2017 was allocated to response, and less than 4 percent was directed towards prevention or preparedness.

Forests are critical, but without investment in how land is managed and protected, their value is neither stable nor guaranteed. Protecting forests requires investing not only in conservation, but in the conditions that keep forests standing.

    Each dollar invested in wildfire-resistant construction could save around $210 in avoided future economic losses, according to a report by the World Economic Forum and Forest Future Alliance. Despite this evidence that prevention can significantly reduce future costs, wildfire resilience remains chronically underfunded.

    This spending discrepancy is creating significant challenges for insurers, asset owners and financial institutions. Global insured losses from natural catastrophes reached $107 billion in 2025, with wildfires, floods and storms accounting for 92 percent of claims.

    In this context, insurers are reassessing where and how they are willing to underwrite risk. Around 56 percent of global wildfire losses between 2000 and 2023 were uninsured. In some high-risk areas, insurers are scaling back coverage altogether, leaving homeowners, businesses and governments to shoulder a growing share of the costs – making it increasingly difficult to break even.

    Proven solutions are already paying off

    In many regions, wildfires are driven not by natural causes but by the deliberate clearing of land for agriculture. Degraded landscapes are becoming drier, more flammable and increasingly vulnerable to catastrophic loss, creating a vicious cycle of deforestation, economic damage and rising emissions.

    The answer is not simply stronger firefighting capacity. Governments, investors and businesses must work together to shift capital upstream into prevention, resilience and long-term landscape stewardship of healthy forests. That means planting appropriately, investing in heat-resistant species, exploring approaches that minimise fire footprints through active management, and exploring the AI and technology solutions that are burgeoning.

    A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

    A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

    Solutions to this already exist and are proven to have an impact. Following devastating wildfires year-on-year, Portugal shifted its approach to wildfire management, increasing prevention spending within its national rural fire management system from around 20 percent in 2017 to approximately 60 percent in 2022. While many countries remain locked in a reactive cycle of disaster response, public policy can shift investment upstream and make resilience a priority before fires occur.

    Indigenous communities have long used proactive land stewardship to reduce wildfire risk while supporting healthy and productive landscapes. For example, the Cheslatta Carrier Nation in British Columbia traditionally managed fuels through cultural fire practices but now implements mechanised fuel removal methods under commercial agreements. By combining Indigenous stewardship with sustainable forest management, Cheslatta is generating community benefits while also boosting wildfire prevention.

    Resilience can also be strengthened through finance and technology. FireSat, a partnership led by Earth Fire Alliance with Google.org, the Gordon and Betty Moore Foundation and Muon, is a satellite constellation designed for rapid wildfire detection. Scanning every 20 minutes, it can detect fires 400 times smaller than current systems and track them through smoke and darkness in almost real time. In California alone, FireSat could prevent up to 350,000 acres from burning each year. It has recently received significant new investments allowing it to expand towards a constellation of more than 50 satellites that will monitor every point on Earth every 20 minutes or less.

    In Brazil’s Pantanal, the Embrace the Forest initiative uses AI-powered detection towers across 2.5 million hectares to support earlier intervention and faster response. During the severe 2024 fire season, the initiative contributed to a 40 percent reduction in burned area compared to 2020.

    A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

    A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

    These examples illustrate what is possible when resilience is treated as an investment priority rather than a recovery cost. But we must ensure funding for these measures is scaled before disaster strikes. Initiatives like the Global Wildfire Leadership Network (GWLN) are key, bringing together corporate decision-makers, investors, insurers, governments and Indigenous leaders to direct investment towards prevention and align finance, technology and stewardship to protect nature, safeguard communities and strengthen future economic stability. With a goal of doing more together than the sum of our parts, the network focuses on Forest Future Alliance GWLN Solutions Labs – where partners sign up with the intent to collaborate.

    Rewarding prevention

    Financial incentives must be created that reward prevention. This can be done by scaling public-private partnerships, supporting long-term landscape stewardship, investing in community capacity including Indigenous wisdom and technology. Ultimately, our terrestrial natural reserves are critical infrastructure that support resilient economies and thriving communities.

    One in three people are dependent on forest services, goods and economic opportunities for survival, so it’s in all our interests to protect what we have. Forests support cooling, water and food security – and are a very cost-effective way of removing carbon dioxide from the atmosphere, where done appropriately.

    UN chief warns climate crisis “in overdrive” as El Niño threatens to fuel the fire

    No sector can solve this challenge alone. The benefits of wildfire resilience are shared across communities, governments, insurers, investors, utilities and businesses. A single intervention can protect homes and livelihoods, reduce insurance claims, secure water supplies and lower future public costs. Because the benefits are shared, the solutions must be too. Coalitions of actors can take proven approaches further than any one individual or organisation could alone.

    As wildfires continue to burn at an unprecedented scale, the opportunity now is to roll out solutions, shift investment upstream and build a future where resilience, rather than recovery, becomes the foundation of thriving economies.

    The post From firefighting to future-proofing: Preventing wildfires must be the priority appeared first on Climate Home News.

    From firefighting to future-proofing: Preventing wildfires must be the priority

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    Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C

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    Methane is a powerful greenhouse gas and the second-largest contributor to global warming after carbon dioxide (CO2).

    Methane traps heat in the atmosphere more efficiently than CO2, but has a significantly shorter lifespan, fading after just a few decades.

    Therefore, reducing emissions of methane – a gas primarily produced by agriculture, fossil fuels and waste management – is a powerful option for limiting global warming in the near-term.

    Yet climate strategies and models often only focus on CO2, or combine all greenhouse gases into one metric known as “CO2 equivalent”.

    The latter approach makes reducing methane emissions dependent on modelling choices and assumptions about the “equivalence” of methane and CO2.

    It hides the opportunities and challenges linked to methane’s high warming and short lifetime.

    In a new study, published in Communications Earth & Environment, we offer a different perspective that “decouples” CO2 and methane reduction and takes global warming limits as a starting point for determining the required level of methane cuts.

    We show that, even under the most ambitious existing national net-zero targets, an absence of methane reduction leads to peak warming that exceeds 1.85C above pre-industrial levels.

    The study highlights that, to limit peak warming to well-below 2C, net-zero CO2 targets must be complemented by stringent methane emissions cuts.

    CO2 equivalent

    How much methane corresponds to one tonne of CO2?

    The question is as difficult to answer as: ‘how much spaghetti equals a chicken?’ You could compare the two meals according to their calories, protein content or cost. Each metric can be convenient, but is only valid for that specific comparison – no amount of spaghetti is the same as a chicken.

    The same is true for the conversion of emissions of methane and other gases to CO2-equivalent emissions. It can be convenient, as it allows different gases to be compared or combined into a single number. This is why the metric is used in climate targets or evaluating the effectiveness of different mitigation options.

    But, because methane and CO2 have different atmospheric lifetimes and warming properties, any conversion is only valid for a chosen time horizon and a chosen baseline.

    Depending on the assumptions baked into calculations, methane mitigation can either appear as an immediate priority or framed as almost unnecessary.

    There are a number of metrics that scientists use to convert greenhouse gases – whether methane, hydrofluorocarbons or nitrous oxide – into CO2-equivalent emissions:

    • “GWP20” measures how much heat a greenhouse gas traps in the atmosphere over a 20-year period, relative to CO2. It emphasises urgent methane mitigation but has been criticised for its implicit discounting of future damages.
    • “GWP100” looks at a 100-year timeline. It gives more weight to long-term warming and is used in “integrated assessment models” (IAMs) used by scientists, national emission reporting to the UN and by the GHG Protocol used by companies.
    • GWP*” considers the rate of emissions, rather than warming over a fixed time horizon. Under GWP*, very limited methane reductions bring CO2-equivalent emissions to zero, meaning remaining methane emissions can be designated as causing “no additional warming”. (This interpretation remains controversial as it assumes the continuation of historical levels of warming.)

    IAMs are the tools used to generate future emissions scenarios. Because they combine CO2 and methane emissions, the impact of methane emission cuts alone is difficult to isolate in existing emission scenarios.

    IAM-generated scenarios also assume mitigation decisions driven by costs. Combinations of CO2 and methane emission pathways that are not purely cost-effective are, therefore, not represented, even though climate policy is messy and emission pathways are rarely cost-effective in the real world.

    Only a few countries – including Japan, Mexico and South Korea – specify methane mitigation targets.

    A different approach

    In our study, we separate CO2 and methane emissions and treat them as independent.

    Instead of choosing a conversion method, we suggest that states and organisations set a limit on peak global warming first, then, based on their existing net-zero targets, determine the minimum compatible methane reduction target.

    Companies and countries around the world have set net-zero targets focused on CO2, as well as those that include all greenhouse gases. As a result, our research looks at the necessary methane reductions for both types of goal. We consider scenarios where companies or countries deliver linear – in other words, steady – emissions reductions to reach net-zero.

    Using a simple climate model, we systematically combined methane and CO2 (or greenhouse gas) mitigation pathways starting in 2025 and calculated peak warming.

    The figure below shows how peak warming depends on both the year of reaching net-zero CO2 and the level of methane cuts.

    Peak global warming relative to 1850-1900 reached until 2100 (50% likelihood), for combinations of the year of global net-zero CO2 emissions (x-axis) and the change in global methane (CH4) emissions between 2020 and that year (y-axis), assuming linear trajectories. Black lines are contours of equal peak warming. The three bars on the right show independent estimates of where CH4 emissions could or would land on the same vertical scale: CH4 mitigation available at no net cost (IEA, red), the 2030 mitigation potential (Global methane status report, orange), and the current legislation scenario for 2050 (Global methane status report, purple). Adapted from Weber et al. (2026).

    The blue arrows in the figure show that to limit warming to 1.7C under a 2050 net-zero CO2 scenario, methane emissions would need to fall by at least 69% by 2050, relative to 2020.

    Our research also finds that, if an organisation or country’s 2050 net zero-target covers all greenhouse gases, its methane emissions would need to fall by 63% instead.

    However, under current policies, methane emissions are expected to increase by around 20% by 2050, relative to 2020. We find that this pathway would result in peak warming above 2C by 2050 – even if global CO2 emissions were to reach net-zero by that date (see purple bar on the right-hand side of the figure above).

    The figure also shows how, if methane emissions remained at 2020 levels and net-zero CO2 was delivered by 2040 or later, warming would exceed 1.85C. This level of warming is above what has been argued as consistent with the Paris Agreement’s “well-below” 2C limit.

    Conversely, cutting methane emissions by around one-third – in line with the Global Methane Pledge target for 2030 – could reduce peak warming by 0.15C, of which 0.05C could be delivered by interventions that come at no net cost. These are shown by the orange and red bars, respectively, on the figure above.

    The table below highlights the minimum compatible methane cuts for three different peak warming levels and net-zero CO2 or greenhouse-gas emission targets.

    Peak warming Year of net-zero CO2 emissions Year of net-zero greenhouse-gas emissions
    2050 2060 2100 2050 2060 2100
    1.7C -69% -63%
    1.8C -32% -56% -11% -47%
    2C +8% -8% -83% >50% +33% -78%

    Minimum methane emission reductions between 2020 and the year of net-zero emissions, consistent with peak warming of 1.7C, 1.8C, and 2.0C at 50% likelihood, assuming linear emission trajectories. For some net-zero targets and peak warming levels, there are no compatible methane mitigation targets (indicated by “–”).

    Remaining carbon budget

    The global carbon budget refers to the amount of cumulative CO2 emissions allowable while still meeting a particular global warming threshold.

    The 2021 climate science report from the Intergovernmental Panel on Climate Change (IPCC) and a 2023 Nature study estimated that, by 2025, the remaining carbon budget for holding warming to 2C would be around 1,000-1,150bn tonnes of CO2 (GtCO2).

    We find that these estimates are founded on the assumption of methane reductions of 27-35% by 2050, relative to a 2020 baseline. (A 2024 Communications Earth & Environment study reached similar conclusions.)

    Under the GWP* metric, where methane emissions are only cut to maintain “no additional warming”, the remaining carbon budget would be constrained. The best estimate of a 2C budget shrinks by around 30% to approximately 750GtCO2.

    Finally, if methane emissions are not cut at all in the future, our findings suggest that the remaining carbon budget for 1.7C of global warming has, in effect, already been exhausted.

    Our analysis shows how peak warming depends on both CO2 and methane reduction – and how methane-specific targets can help refine existing net-zero targets.

    Crucially, we show that complementing net-zero CO2 targets with stringent methane cuts is necessary to limit peak warming to well-below 2C.

    Weber, K. et al. (2026) Limiting warming by CO2 and methane mitigation in an expanded scenario space, Communications Earth & Environment, doi:10.1038/s43247-026-03832-1

    The post Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C appeared first on Carbon Brief.

    Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C

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