What’s on the climate calendar for October 2026?

Welcome to the latest edition of The Climate Agenda – a subscriber-only newsletter designed to keep you informed of the key events, negotiations and announcements happening every month.

We’ll be on the ground reporting from the Convention on Biological Diversity summit in Yerevan, Armenia later this month and following all the developments as we build towards COP31 in Antalya, Türkiye next month.

Welcome to the latest edition of The Climate Agenda – a subscriber-only newsletter designed to keep you informed of the key events, negotiations and announcements happening every month.

We’ll be on the ground reporting from the Convention on Biological Diversity summit in Yerevan, Armenia later this month and following all the developments as we build towards COP31 in Antalya, Türkiye next month.

Here’s what you need to know for October, why it matters and what to expect.

Brazilian Election

First round: Sunday 4 October – Second round: Sunday 25 October

This poll is being closely watched by Brazilian environmentalists as it’s likely to make a big difference to Brazil’s international climate politics and the health of the Amazon rainforest. 

The two clear front-runners are current left-wing President Lula and right-wing Flávio Bolsonaro. Flávio is the son of Jair Bolsonaro, who ruled from 2019 to 2023 but was declared ineligible to hold public office because of his attacks on the electoral system and is now under house arrest.

In the unlikely event that either candidate wins more than half the votes in the first round, they will be elected as the country’s leader. Latest polls have Lula on 39% and Bolsonaro on 35% (though the numbers are shifting) with several minor candidates in the single-digits. If none of them get a majority, there will be a one-on-one run-off on October 25.

The Latin American nation is set to record its lowest-ever level of deforestation, as efforts to rein in illegal clearing and restore Indigenous rights progressed under Lula. But Brazilian experts are warning that the huge agribusiness lobby in Congress, whose interests shape what happens in the Amazon, will be emboldened if Bolsonaro takes power, with the Supreme Court also risking a turn to the right.

As for climate politics, some seasoned watchers fear that Flávio – a climate change denier like his dad – could even try to pull Brazil out of the Paris Agreement. That would leave other countries to take forward Brazil’s COP30 global roadmaps on transitioning away from fossil fuels (TAFF) and ending deforestation – both of which are due to be delivered by COP31. 

For Brazil’s own TAFF roadmap – commissioned earlier this year but so far nowhere to be seen – the election may have less of an impact, given Lula is as keen as any other politician to extract oil and gas from the Amazon, amid cross-party support for fossil fuel production.

Read more: Brazil leads “encouraging” decline in global rainforest destruction in 2025

Pre-COP

Monday 5 October – Thursday 8 October – Fiji and Tuvalu

The annual Pre-COP meeting is usually a business-like gathering of government negotiators, sounding out each other’s positions and laying the groundwork for deals at the main COP summit. But this year’s “pre” has been jazzed up by Australia’s partnership with Pacific governments keen to elevate their climate issues on the international stage.

“We will bring the eyes of the world to our region, highlight the threat that climate change poses to it, and show how Pacific voices are shaping global action to counter it,” Australian PM Anthony Albanese said of the event.

On Monday, before the Pre-COP officially starts, a group of senior government figures – including a handful of leaders – will visit the world’s second lowest-lying nation Tuvalu, as UN boss Antonio Guterres did in 2019.

They will visit areas affected by sea level rise, see climate resilience projects and meet local communities before flying 2.5 hours south to Fiji to join up with the Pre-COP – which starts on Tuesday – and speak at a “Leaders’ plenary session” that evening.

The Pre-COP runs until Thursday. Governments are expected to try to advance on some kind of a roadmap for protecting oceans from climate change, while Fiji says Pacific nations will emphasise the need to follow science and step up efforts to limit warming to 1.5C. 

Australia is also due to present an action plan to improve access to climate finance for small island nations and least-developed countries, so that governments, development banks and climate funds can endorse it ahead of the Antalya summit.

Alongside the official Pre-COP discussions, a “green zone” will host talks organised by civil society on topics like public transport, carbon markets and the International Court of Justice advisory opinion. Unfortunately, these events won’t be available to follow online.

Read more: Threatened by rising seas, small islands secure right to keep their statehood

Read more: At regional summit, Pacific islands ask for COP31 support for clean energy and finance

Article 6.4 Supervisory Body

Monday 5 October – Friday 9 October – Bonn, Germany

The UN carbon market’s rule-making body meets for one last jam-packed session ahead of COP31, with decisions pending on several high-stakes issues that could shape the future of the new crediting mechanism.

Top of the agenda is a rulebook for clean cooking projects, which aim to cut greenhouse gas emissions by distributing more efficient cookstoves. These projects generate some of the most popular carbon credits but have also drawn some of the heaviest criticism for overstating their climate benefits through lax accounting.

Technical experts have recommended the Supervisory Body tighten the rules compared to existing crediting programmes, including by forcing cookstove project developers for the first time to guard against the risk of the climate benefits of their credits – the trees saved from becoming cooking fuel – being wiped out by fire, drought or logging. 

The proposal on the so-called reversal risk assessment has sparked a “coordinated” lobbying campaign from the industry, some conservation NGOs and UNEP, arguing that stronger protections could hike project costs and restrict the supply of credits.

Read more: Industry and NGOs lobby to weaken UN carbon credit rules in “coordinated” push

Intergovernmental Panel on Climate Change (IPCC) plenary

Monday 12 October – Friday 16 October – Addis Ababa, Ethiopia

Scientists and government officials will try, once again, to agree on a timeline to produce the highly influential AR7 assessment report from the UN’s climate science body. 

The faultlines that have blocked a deal at several previous sessions are well established: a large group of predominantly developed countries, small island and progressive Latin American states and the poorest nations want the reports to be ready in time to inform the UN’s next global assessment of climate action, due to be completed in November 2028. 

A small group of primarily big emerging economies disagree, claiming this timeline would put a burden on developing countries with limited resources and restrict their ability to provide scientific input into the process.

Three options will be on the table in Addis Ababa. Two of them would see all three flagship assessment reports approved by July 2028 and September 2028 respectively, just in time to feed into the second Global Stocktake. 

The third, based on proposals from Saudi Arabia and India, would deliver only the Working Group 1 report, on the physical science of climate change, by May 2028. The reports from Working Groups 2 and 3, covering climate impacts and ways to cut emissions, would not be approved until mid-2029, well after the stocktake concludes at COP33.

Delegates are also expected to discuss the IPCC’s increasingly strained budget, made worse by a funding gap left by the withdrawal of the United States. The panel has warned that, without a sustained increase in contributions, its trust fund’s cash balance would run out by the end of 2028, putting the delivery of the AR7 set of reports at risk and forcing cuts to in-person meetings, translation and outreach.

Read more: Science ‘under attack’ from fossil fuel interests at UN climate talks

Read more: As science comes under attack at UN talks, climate movement splits over how to respond

World Bank & IMF Annual Meetings

Tuesday 12 October – Sunday 18 October – Bangkok, Thailand

With their biggest shareholder – the US – resolutely opposed to climate action, the World Bank and International Monetary Fund (IMF) are likely to try to avoid mentioning climate change at their annual meetings in Bangkok – and there are no headline events on the subject.

But they aren’t in complete control of the agenda. Thailand will host a discussion on financing a green resilient economy and World Bank President Ajay Banga is likely to be challenged on climate at a live-streamed civil society townhall on October 12.

With tricky negotiations on the World Bank’s climate finance target concluded earlier this year (it was dropped), talks are moving on to the sustainability framework of the World Bank’s International Finance Corporation, which invests in the private sector. Civil society is calling for its rules on protecting people and the planet to be maintained and strengthened.

The IMF’s guidance note to staff – which shapes the circumstances under which climate can be included in IMF programmes – will also be negotiated. Longer term, the Resilience and Sustainability Trust, which channels funding to green projects, will be reviewed but not before 2028 at the earliest.

Read more: World Bank’s climate work can endure without finance target, experts say

Convention on Biological Diversity (CBD) COP17

Monday 19 October – Friday 30 October – Yerevan, Armenia

The biodiversity COP – a sister convention to the UN climate process – will for the first time take stock of progress towards key goals in its 2022 landmark agreement, the Global Biodiversity Framework (GBF). These include a headline target to protect and conserve at least 30% of the planet’s land and marine ecosystems by 2030. 

A draft report prepared by a scientific panel warns that “unless collective implementation accelerates rapidly, the 2030 targets and mission will not be achieved”. In fact, governments are failing on 22 out of 23 targets. The final report is expected to be published ahead of COP17, where governments are expected to react strongly.

UN biodiversity chief Astrid Schomaker told journalists earlier this month that the most significant progress is expected to occur towards the end of the decade, as 174 countries took the first four years to develop national targets. 

Finance, meanwhile, is set to become a contentious issue, as the draft report says developed countries fell short on a target to provide $20bn per year in international public finance for nature protection, reaching only about $17bn per year from 2020 to 2023. They have also yet to meet a wider goal to mobilise $200bn per year counting all kinds of finance.

Much like in climate talks, the EU has proposed to broaden the base of donors to include emerging economies who want to “voluntarily assume the obligations” of developed countries. Saudi Arabia and Qatar want nothing to do with this proposal. China has said bringing in new contributors should not weaken the obligations of developed countries. Expect a fight in Yerevan.

A preliminary meeting in Nairobi in August resulted in a heavily bracketed text that delegates will have to unravel in Armenia. One observer said countries had “overall missed the level of urgency” needed.

Keep an eye out for our webinar live from Yerevan later this month, where we’ll provide an update on the talks and how governments are responding to science’s demands for quicker action.

Read more: Mombasa ocean summit drives progress on marine protection, but threats persist

Read more: UN biodiversity talks agree finance roadmap, postponing decision on a new fund

European Climate Resilience & Risk Management Framework

Wednesday 28 October – Brussels, Belgium

Following a torrid summer beset by recurring heatwaves, drought and outbreaks of forest fires across the continent, the European Commission will present its keenly awaited climate resilience and risk management framework to help member states protect their populations from worsening climate change impacts.

As part of the policy package, the Commission will identify 100 of Europe’s most climate-vulnerable territories. And alongside an assessment of the risks, there will be guidance at which level they should be managed – regional, national or by the EU. Currently, confusion often arises over who is responsible for preventing, preparing for and managing disasters across the bloc.

The framework will also aim to make Europe a “champion in adaptation technologies” – such as drought-resistant crops, flood prevention or energy-efficient cooling – which have been described by EU President Ursula von der Leyen as “a huge emerging market”. 

With only around a quarter of catastrophe losses in Europe covered by private insurance, the Commission also plans to set up a Climate Insurance Alliance to boost that figure.

READ MORE: WHO issues new guidance on heat-health action plans, as El Niño sets in