For 200+ years, fossil fuels have been at the heart of the global shipping industry. The 21st century must be a time of change: port cities can unlock billions in investment, create new green jobs, and deliver cleaner air by transforming into clean energy hubs. From @c40cities.bsky.social & Arup:

Last week, I attended the UN NDC Summit during Climate Week NYC, which was an unexpectedly positive week for climate action. My top highlights:

I remember being told that it would take 193 years to reach legal limits for nitrogen dioxide. I decided this was unacceptable. Thanks to the bold policies we put in place, we've managed to do it in nine years - 184 years earlier than expected.

Climate Week NYC ✅ Next stop 📍 World Mayors Summit and COP30

Over the past decade, local governments have shown that they can deliver some of the most effective and rapid climate solutions. Cities are not waiting for international agreements, they are taking action. @c40cities.bsky.social @mayors4climate.bsky.social www.linkedin.com/pulse/turnin...

At #ClimateWeekNYC, mayors from around the world proved how cities are stepping up on climate action and standing together to protect the people and places we love.

Great to meet with the @cop30brazil.bsky.social High-Level Champion Dan Ioschpe who has made huge progress on consolidating the the action agenda to ensure it can deliver on the goals of the Paris Agreement. #ClimateWeekNYC

C40 Cities Co-Chair and Mayor of Freetown, Yvonne Aki-Sawyerr, implored national governments and financial institutions to match cities’ climate ambition. Showcasing Freetown’s tree-planting campaign, she called for global action: cities are delivering, now it’s time for the world to back them.

“We are united by a common purpose: to ensure that the energy systems of our cities are not just functional, but transformative, providing reliable power, fostering economic growth, and creating opportunities for every citizen.” - C40 Co-Chair, Mayor Aki-Sawyerr at Climate Week NYC.

Great to see Søren Staugaard Nielsen and Michael Simmelsgaard at Climate Week NYC. Ramboll's unrestricted funding to @c40cities.bsky.social is an example of great leadership in the sector and a vote of confidence in resilient cities where communities and nature thrive.

It’s great to be in New York for Climate Week NYC. Mayors are on the ground showing that local leaders are delivering real solutions in the face of rising climate threats. @annehidalgo.bsky.social, @valplante.bsky.social, @mayorofchicago.bsky.social, @mayorgallego.bsky.social

New York Climate Week is an essential moment for global climate action on the road to COP30. The work C40 mayors are doing to create green jobs, transition to clean energy, and build liveable cities is proof that climate action is not only possible but politically popular and economically smart.

Great to be marching in London today to Make Polluters Pay

The U20 Summit in Johannesburg closed with one clear message: cities are key to a renewed global push for a fairer, climate-safe future for all. The momentum to empower cities and unlock direct climate finance must move forward into the G20, into COP30, and beyond: c40.me/4gphstr

It was great to meet with Ana Toni today alongside Mayor of Rio de Janeiro @eduardopaesoficial.bsky.social where we discussed COP30 and the critical role of local leaders in helping to drive from negotiation to action. @cop30brazil.bsky.social

I'm grateful to our brave officers who put themselves on the line to keep Londoners safe this weekend. The violence towards our officers and the racism we saw has no place in our city. The far-right wants to divide us. They will never succeed.

Great news: most people back bold climate action. Research shows that 69% of people said they’d give 1% of their income to tackle climate change but policymakers underestimate this public support, which is holding back ambition. We can and must do more, now. www.theguardian.com/environment/...

President Trump’s rejection of the International Maritime Organization's net zero framework isn't a defence of the American people, it's a handout to the fossil fuel industry. His claim that LNG, a fossil fuel, serves the public is misinformation that prioritises corporate profit over public health.

Having had to miss Glastonbury, I think I enjoyed Latitude Festival even more this year. Four music-filled days in the idyllic grounds of a Suffolk hall, spent with many of my oldest and dearest friends was, unsurprisingly, a joy-filled experienced. markontour.com/2025/08/08/l...

A powerful piece from @michaelrbloomberg.bsky.social on how denial makes disasters like the recent Texas floods more deadly - and how practical solutions can help us manage the climate crisis. www.bloomberg.com/opinion/arti...

Today, I met with the Mayor of Kuala Lumpur, Maimunah Mohd Sharif. We discussed her flagship programmes which are truly impressive, structured and include an inclusive approach to city governance. It's clear that Kuala Lumpur is taking a serious, strategic approach to tackling the climate crisis.

This year, the C40 World Mayors Summit will kick off the Local Leaders Forum, co-hosted by @bloombergdotorg.bsky.social and @cop30brazil.bsky.social Presidency. Convened by mayors @london.gov.uk and Rio in Rio de Janeiro, it will place subnational voices at the heart of the COP30 process.

Yesterday at #LCAW25, I was delighted to sign a new strategic partnership between C40 Cities and the Centre for Liveable Cities. CLC is at the cutting edge of innovative urban development. This partnership will support city leaders in advancing people-centred, climate-resilient urban policies.

An excellent meeting today between C40 mayors & the UK FCDO. Cities are essential partners in helping national governments meet their goals. We're grateful for FCDO’s continued support of our UCAP Climate Action Implementation Programme. With the right backing, cities can go further, faster.

Today, I visited "From Paris to Belém, 10 Years of Urban Transformations" - a fantastic exhibition showcasing how mayors are improving lives through cleaner air and more accessible public spaces. From Stockholm to Seoul, cities are leading the way in driving down emissions & boosting resilience.

A decade of impact. ✍️🇫🇷 10 years on from the signing of the Paris Agreement, mayors are highlighting their city achievements and renewing their commitment to ambitious climate solutions.

Science has shown us for decades that the climate crisis is happening and is accelerating at alarming rates. That is why in December 2015, 196 nations came together at COP21 in an unprecedented act of international cooperation to sign the Paris Climate Agreement. 👇

Fantastic to see C40 Co-Chair @london.gov.uk @sadiqkhanlondon.bsky.social speaking about the leading climate action he has delivered as mayor - the worlds largest clean air zone, 5x more bike lanes, divesting pension funds from fossil fuels and much more. (1/2)

10 years on from Paris, cities & local leaders are the best hope for climate action. Cities are already proving that a just, people-first transition is not only possible, but is already happening. Read me & @laurencetubiana.bsky.social for @oglobo.globo.com 🇧🇷: oglobo.globo.com/opiniao/arti...

J'ai été honorée d'être à l'Hôtel de Ville de Paris pour célébrer les 10 ans de l'Accord de Paris sur le climat et d'entendre l'incroyable @annehidalgo.bsky.social expliquer comment ses politiques ont permis de réduire la pollution atmosphérique de 60 % grâce à une réduction du trafic de 40 %.

Honoured to be at Paris City Hall to celebrate 10 years of the Paris Climate Agreement & hear the incredible @annehidalgo.bsky.social explain how her policies have cut air pollution 60% as a result of reducing traffic by 40%

C40 Cities was part of a historic first: the U20 Sherpa Meeting held in Africa, co-chaired by Tshwane & Johannesburg. U20 cities shaped a joint communiqué on climate, equity and finance. With UCLG, we’re making sure urban voices are heard at the G20: c40.me/4eaORXY

👉 #LCAW25 next week: Nairobi Governor Sakaja Johnson, @valplante.bsky.social and David Miller will discuss how urban leaders are delivering bold, practical climate solutions in the face of political pushback and disinformation. 🕐 Wednesday 25 June at The Conduit www.theconduit.com/upcoming-eve...

Serving risotto is a sign of love, because cooking the dish "demands both attention and patience". So says my friend, Monika Milewska, about her Dad’s Risotto Primavera recipe in her cracking Pantry Diaries Substack. So next time i serve anyone risotto.. monikamilewska.substack.com/p/risotto-pr...

In a year of record heat, disinformation and political setbacks, I’ve never been prouder of the leadership shown by C40 cities. The future of climate action is local, and it’s already underway. This is what people-first, inclusive, and effective climate leadership looks like: c40.me/45t16MY

From Ahmedabad to London, the climate crisis is a health crisis. Cities are on the frontlines of climate-driven health crises, from deadly heat to disease spread. The Centre's new journal issue explores how climate action is key to residents' health: utppublishing.com/toc/jccpe/3/...

Mayors are stepping up & showing that climate leadership can be practical and put people first. As @kljohnson7.bsky.social puts it, mayors are on the ground, hearing directly from residents and responding with helpful solutions. Great to see so many @c40cities.bsky.social featured in @grist.org ⬇️

Yesterday, I visited the new cold food storage hub @wutrain.bsky.social opened - an impressive project inspired by C40’s work in Milan. It’s helping fresh food that would otherwise go to waste reach food insecure families across the city. Boston is showing how climate policies deliver benefits.

I’m visiting Boston, where @wutrain.bsky.social is turning climate ambition into action. This morning, I joined a community celebration for the first grants from Boston’s Equitable Emissions Investment Fund - where the city is supporting decarbonisation in affordable housing. (1/2)

Fighting for a better world can often feel like an uphill battle, but we can't lose hope. Here are a few recent articles, podcasts and interviews I’ve found helpful in shedding light on the dynamics of an increasingly chaotic world. 🧵⬇️

The power outages in Spain & Portugal are worrying. For much of the Global South, blackouts are a daily occurrence due to antiquated energy systems, badly planned renewables & extreme weather worsened by fossil fuels. Disinformation around events like these only distracts from this global crisis.

Climate 🤝 economy Europe’s climate and industrial policies are inextricably linked - and cities are at the heart of both. My piece for @politico.com: c40.me/4jtjUA0

It's hard to get your head around the scale of the environmental vandalism the Labour government is hoping to unleash. The Planning and Infrastructure Bill is up there with Trump's executive orders. And the reason is the same: corporate power. This week's column. www.theguardian.com/commentisfre...

BP's climate U-turn could cause over 400,000 deaths by 2050. This is not a business decision - it's a public health catastrophe. The era of fossil fuels must come to an end. globalwitness.org/en/press-rel...

Pope Francis was a true global leader whose commitment to climate justice has inspired millions. On behalf of C40 Cities, I extend our deepest condolences and reaffirm our dedication to the urgent climate action he so passionately championed.

It's inspiring to see C40 Co-Chair & @london.gov.uk @sadiqkhanlondon.bsky.social and Governor of Nairobi, Sakaja Johnson working collaboratively to address the climate crisis, and foster closer ties. Together, city leaders can spearhead the urgent climate action the world needs.

Great to plant a tree as part of #FreetownTheTreetown - where residents earn tokens to plant & monitor trees. So far over 1.2mn trees have been planted - helping strengthen resilience & reduce carbon emissions. A brilliant example of climate action delivering economic & environmental benefits.

This week in Freetown, I’ve had the opportunity to meet with Vice President of Sierra Leone Dr. Mohamed Juldeh Jalloh, Deputy Minister of Local Government and Community Affairs, Hon. Alfred Moi Jamiru, ⁠⁠Alexandra Maclean, Director of Development at the FCDO ⁠⁠and the national media of Sierra Leone.

I'm excited to be in Freetown - a city leading the way on climate resilience. It’s great to spend time with climate champion and C40 Cities Co-Chair Mayor Aki-Sawyerr. This week, I’m meeting leaders to strengthen partnerships and visiting climate projects driving real impact.

Air pollution isn’t just an environmental issue - it’s a public health emergency claiming over 8 million lives annually. We need national governments to step up to ensure the right to clean air is afforded to all.