Mark Watts

@mark--watts.bsky.social

Executive Director at C40 Cities | TIME100 climate leader | All views my own | He/him | Talks about climate 🌱, music 🎸 mountain running ⛰️ http://markontour.com

Resilience was the clear theme at the recent World Cities Summit I attended in Singapore 👇 One message stood out: urban nature is not a luxury – it is essential infrastructure for building liveable, resilient cities.

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In cities, resilience and nature can go hand in hand. Beijing transformed a former industrial site into a lush space that absorbs rainwater, reduces flood risk, and allows wildlife to thrive. Places like City Central Green Forest Park show what’s possible.

It’s amazing what the shift to renewables can look like. A theme park, a transport hub, and a library – all powered by clean energy. In Beijing, the transition is visible and practical, powering the places people use every day.

The best climate solutions do several things at once. At Shanghai's Luojing Port, ships plug in instead of burning fuel, cutting noise & cleaning the air for workers & nearby communities. The shift also helps push global shipping towards greener operations. That's the power of city climate action.

Beijing has cut PM2.5 pollution by nearly 70% since 2013, and you can feel and see the difference. More people outdoors, more cycling and running, more green spaces. Climate action woven into everyday life looks just like this.

As climate risks accelerate, investment in resilience is essential - and cities are on the front lines. C40 Cities' new report confirms what cities have known all along: that well-designed adaptation projects deliver clear economic and financial value.

Heidi Sørensen, who passed away on 25 April after living with cancer for years, was a pioneer in the global climate movement. At C40 Cities, we remember Heidi as a tenacious innovator who proved that cities must lead the way in solving the climate crisis.

A medium shot of a smiling woman with long auburn hair and freckles, standing outdoors. She is wearing a rust-coloured, patterned dress paired with a matching cropped cardigan that has silver buttons. The background is a soft-focus view of a tree-lined walkway.

Cities are showing that a future beyond fossil fuels is possible - and already underway. From cutting demand to scaling clean energy, mayors and local leaders are turning ambition into delivery. The task now is to ensure that the transition is just, coordinated, and irreversible.

A commentary in @nature.com argues the 1.5°C temperature limit has “outlived its usefulness” because we’re headed towards overshoot and should be replaced by a “clean-energy shift” metric. That’s the wrong diagnosis. Here is why. www.nature.com/articles/d41...

As we breach 1.5 °C, we must replace temperature limits with clean-energy targets

Actionable goals are needed to guide the world towards what needs to happen most quickly: shifting economies to clean energy sources.

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Great to meet with New York’s new Chief Climate Officer, Louise Yeung and other colleagues from across the NYC city government. New York has long been a climate leader. As one of the first members of C40 Cities, it has always set the pace for bold and practical action.

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A standout moment at the #WMS25: youth activists declaring, "We do this for our today, we do this for our tomorrow, and we will do this together.” This new Hot Takes episode from the Cities 1.5 podcast brings the young voices we heard to even more people - an absolute must-listen: lnk.to/HotTakes2

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How 2 people helped expose a $10B Exxon scandal. I highly recommend the latest episode of Cities 1.5, where Lindsey Gulden sheds light on how Exxon’s shocking overvaluation was protected by disinformation and silence. The fossil fuel industry’s culture of deception must be stopped. lnk.to/S6E3

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“One city does something and a hundred of us then will take it to scale. I find hope in the fact that cities can make this work” - inspiring words for difficult times from the Mayor of Austin, Kirk Watson, in the latest episode of the Cities 1.5 podcast: lnk.to/S6E2

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Privileged to accompany @london.gov.uk to welcome United Nations Secretary General, Antonio Guterres, to London today. Inspired by his leadership on climate & so much else & motivated by his message that we must up the pressure to shift off polluting fossil fuels

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We must end the fossil fuel era. UN Secretary-General, António Guterres, knows this better than anyone. I want to thank him for his steadfast climate leadership and his commitment to phasing out fossil fuels. A pleasure to meet today together with C40 Cities Co-Chair, Mayor of London Sadiq Khan.

An image of three men in formal attire standing side-by-side in a modern indoor setting with dark wood paneling.

From left to right:

Mark Watts, Executive Director of C40 Cities, wearing a black suit, grey tie, and a small green lapel pin.

António Guterres, Secretary-General of the United Nations, wearing a dark suit and a red patterned tie.

Sadiq Khan, Mayor of London, wearing a navy blue suit and an open-collared white shirt.

How are cities and subnational leaders turning negotiation into action? This #COP30 booklet captures the crucial role cities play in tackling the climate crisis, and lays out our COP30 asks. To deliver climate action at the speed required, subnational inclusion at COPs cannot be overlooked.

It’s time to move from promises and negotiations at #COP30 to delivering climate action. To unlock progress, we should focus on where the decisions are really made: cities. Read my op-ed in @politico.com with Jader Barbalho Filho, Minister of Cities, Brazil. www.politico.eu/sponsored-co...

Cities stand ready to lead the decade of delivery at COP30

It’s time to move from promises and negotiations to delivering climate action. To unlock progress, we should focus on where the decisions are really made: cities.

politico.eu

🚨BREAKING: #COP30 President André Corrêa do Lago opens COP highlighting the role of cities 🏙️ "Subnational entities play a central role in implementing the decisions made at COPs. To stop climate change, multilateralism is unquestionably the way forward.”

A medium shot of a man with gray hair and a beard, wearing a suit jacket and white shirt, sitting at a conference table. He is speaking into a microphone, and a nameplate in front of him reads "COP PRESIDENT".A low-angle, outdoor shot of a large, white 3D sign reading "#COP30". The sign sits on a brown base with the text "UN CLIMATE CHANGE CONFERENCE" and "NOVEMBER 10-21, 2025". The sun is low in the sky, creating a lens flare behind the sign. In the background, people walk on a paved plaza in front of a large, modern building.