C40 Cities
@c40cities.bsky.social
A global network of city mayors delivering urgent climate solutions. Protecting the people and places we love. 🌳🌍🌆💚
http://www.c40.org/
http://www.c40.org/
'Tis the season to watch some iconic films 🎄
December 24, 2025 at 10:22 AM
'Tis the season to watch some iconic films 🎄
300 mayors. 50 sessions. 1 shared purpose. To protect the people and places we love.
At the World Mayors Summit in Rio, mayors shared how they are delivering results in their cities.
At the World Mayors Summit in Rio, mayors shared how they are delivering results in their cities.
December 22, 2025 at 4:09 PM
300 mayors. 50 sessions. 1 shared purpose. To protect the people and places we love.
At the World Mayors Summit in Rio, mayors shared how they are delivering results in their cities.
At the World Mayors Summit in Rio, mayors shared how they are delivering results in their cities.
NEW: Cities 1.5 Podcast’s Hot Takes - Dispatches from the Frontlines of the Climate Crisis.
Cities 1.5’s first Hot Take focuses on a major move in Canada’s energy future and what it means for climate, cities, and the promises made to hold fossil fuel giants accountable. lnk.to/HotTakes1
Cities 1.5’s first Hot Take focuses on a major move in Canada’s energy future and what it means for climate, cities, and the promises made to hold fossil fuel giants accountable. lnk.to/HotTakes1
December 18, 2025 at 2:10 PM
NEW: Cities 1.5 Podcast’s Hot Takes - Dispatches from the Frontlines of the Climate Crisis.
Cities 1.5’s first Hot Take focuses on a major move in Canada’s energy future and what it means for climate, cities, and the promises made to hold fossil fuel giants accountable. lnk.to/HotTakes1
Cities 1.5’s first Hot Take focuses on a major move in Canada’s energy future and what it means for climate, cities, and the promises made to hold fossil fuel giants accountable. lnk.to/HotTakes1
The latest Journal of City Climate Policy and Economy issue is here. Climate-neutral construction, just transition strategies, new finance models for urban resilience: see what cities are already putting into practice.
utppublishing.com/toc/jccpe/4/3
utppublishing.com/toc/jccpe/4/3
Contents | Journal of City Climate Policy and Economy 4, 3
Background: Climate adaptation strategies in cities increasingly risk reinforcing housing inequalities through climate gentrification, that is, the displacement of vulnerable residents driven by both climate impacts and adaptation measures that raise the ...
utppublishing.com
December 15, 2025 at 2:03 PM
The latest Journal of City Climate Policy and Economy issue is here. Climate-neutral construction, just transition strategies, new finance models for urban resilience: see what cities are already putting into practice.
utppublishing.com/toc/jccpe/4/3
utppublishing.com/toc/jccpe/4/3
From London hitting clean air targets nearly 200 years early to Bangkok strengthening its targets, here are our 5 top moments from 2025, where cities around the world showed how they are delivering cleaner air and safer futures.
December 12, 2025 at 4:21 PM
From London hitting clean air targets nearly 200 years early to Bangkok strengthening its targets, here are our 5 top moments from 2025, where cities around the world showed how they are delivering cleaner air and safer futures.
Mayors are moving past talk and delivering real progress by committing to Yearly Offers of Action.
Our Co-Chairs are joining other city leaders to turn climate pledges into results.
@london.gov.uk
Our Co-Chairs are joining other city leaders to turn climate pledges into results.
@london.gov.uk
December 11, 2025 at 7:15 PM
Mayors are moving past talk and delivering real progress by committing to Yearly Offers of Action.
Our Co-Chairs are joining other city leaders to turn climate pledges into results.
@london.gov.uk
Our Co-Chairs are joining other city leaders to turn climate pledges into results.
@london.gov.uk
The year of the mayor 🎧
December 4, 2025 at 12:43 PM
The year of the mayor 🎧
To continue driving climate action, cities need more than applause. While we saw progress in Belém, local leaders still lack the recognition, tools and direct finance to scale their impact.
🎧 Tune in to the Cities 1.5 Special for the definitive city-level analysis of COP30 outcomes. lnk.to/Summit2
🎧 Tune in to the Cities 1.5 Special for the definitive city-level analysis of COP30 outcomes. lnk.to/Summit2
December 3, 2025 at 1:25 PM
To continue driving climate action, cities need more than applause. While we saw progress in Belém, local leaders still lack the recognition, tools and direct finance to scale their impact.
🎧 Tune in to the Cities 1.5 Special for the definitive city-level analysis of COP30 outcomes. lnk.to/Summit2
🎧 Tune in to the Cities 1.5 Special for the definitive city-level analysis of COP30 outcomes. lnk.to/Summit2
“This hurricane season made one thing clear: resilience has become a core part of public health." - Dr Quinn Adams on the defining health challenges of the post-hurricane era. More insights and reflections via the C40 Centre's latest Substack: https://thecentre.substack.com/p/hurricanes-are-changing
Hurricanes Are Changing
Are we?
thecentre.substack.com
December 1, 2025 at 4:09 PM
“This hurricane season made one thing clear: resilience has become a core part of public health." - Dr Quinn Adams on the defining health challenges of the post-hurricane era. More insights and reflections via the C40 Centre's latest Substack: https://thecentre.substack.com/p/hurricanes-are-changing
#COP30 fell short - and missed the opportunity to truly shift from negotiation to implementation.
But mayors will not slow down. We're delivering ambitious, inclusive climate action now. The world needs to follow the pace of cities.
But mayors will not slow down. We're delivering ambitious, inclusive climate action now. The world needs to follow the pace of cities.
November 25, 2025 at 4:11 PM
#COP30 fell short - and missed the opportunity to truly shift from negotiation to implementation.
But mayors will not slow down. We're delivering ambitious, inclusive climate action now. The world needs to follow the pace of cities.
But mayors will not slow down. We're delivering ambitious, inclusive climate action now. The world needs to follow the pace of cities.
From cooling centres in Phoenix to tree planting in Quezon City, mayors are fighting extreme heat.
The new C40 Cool Cities Accelerator is scaling these life-saving actions, helping cities worldwide protect residents and build a more liveable urban future.
The new C40 Cool Cities Accelerator is scaling these life-saving actions, helping cities worldwide protect residents and build a more liveable urban future.
November 25, 2025 at 10:02 AM
From cooling centres in Phoenix to tree planting in Quezon City, mayors are fighting extreme heat.
The new C40 Cool Cities Accelerator is scaling these life-saving actions, helping cities worldwide protect residents and build a more liveable urban future.
The new C40 Cool Cities Accelerator is scaling these life-saving actions, helping cities worldwide protect residents and build a more liveable urban future.
Reposted by C40 Cities
My comment on the #COP30 outcome:
Multilateralism needed a boost in Belém, and instead it got a bandage. The COP process needs to take a long, hard look at itself.
Multilateralism needed a boost in Belém, and instead it got a bandage. The COP process needs to take a long, hard look at itself.
November 22, 2025 at 7:20 PM
My comment on the #COP30 outcome:
Multilateralism needed a boost in Belém, and instead it got a bandage. The COP process needs to take a long, hard look at itself.
Multilateralism needed a boost in Belém, and instead it got a bandage. The COP process needs to take a long, hard look at itself.
As we wait for the official outcome of #COP30, here’s a time capsule of its last day: the outrage, the optimism, the urgency, and the sheer human effort that goes into trying to land a deal.
The latest episode of @outrageoptimism.bsky.social featuring C40’s Eric Garcetti & @mark--watts.bsky.social:
The latest episode of @outrageoptimism.bsky.social featuring C40’s Eric Garcetti & @mark--watts.bsky.social:
Inside COP: Friday Night in Belém - uncertainty in the Blue Zone
This episode is a time capsule that captures the feeling of a COP Friday: the confusion, the determination, the fear of losing ambition, and the belief, still very much alive, that progress is possibl...
www.outrageandoptimism.org
November 22, 2025 at 10:04 AM
As we wait for the official outcome of #COP30, here’s a time capsule of its last day: the outrage, the optimism, the urgency, and the sheer human effort that goes into trying to land a deal.
The latest episode of @outrageoptimism.bsky.social featuring C40’s Eric Garcetti & @mark--watts.bsky.social:
The latest episode of @outrageoptimism.bsky.social featuring C40’s Eric Garcetti & @mark--watts.bsky.social:
”On the brink of collapse, #COP30 needs cities to survive”
Former LA Mayor Eric Garcetti warns a non-consensus COP30 would be a "worst message at the most urgent moment."
The solution is to bring cities to the table: an “easy win” to prevent the conference from sinking.
Former LA Mayor Eric Garcetti warns a non-consensus COP30 would be a "worst message at the most urgent moment."
The solution is to bring cities to the table: an “easy win” to prevent the conference from sinking.
November 21, 2025 at 6:54 PM
”On the brink of collapse, #COP30 needs cities to survive”
Former LA Mayor Eric Garcetti warns a non-consensus COP30 would be a "worst message at the most urgent moment."
The solution is to bring cities to the table: an “easy win” to prevent the conference from sinking.
Former LA Mayor Eric Garcetti warns a non-consensus COP30 would be a "worst message at the most urgent moment."
The solution is to bring cities to the table: an “easy win” to prevent the conference from sinking.
Our reaction to the disappointing draft outcome of #COP30 is the lead story in Brazil’s biggest paper today.
A COP30 declaration without any proposal to phase out fossil fuels would be a huge wasted opportunity - and could reduce the global mutirão to ashes.
A COP30 declaration without any proposal to phase out fossil fuels would be a huge wasted opportunity - and could reduce the global mutirão to ashes.
November 21, 2025 at 2:37 PM
Our reaction to the disappointing draft outcome of #COP30 is the lead story in Brazil’s biggest paper today.
A COP30 declaration without any proposal to phase out fossil fuels would be a huge wasted opportunity - and could reduce the global mutirão to ashes.
A COP30 declaration without any proposal to phase out fossil fuels would be a huge wasted opportunity - and could reduce the global mutirão to ashes.
🚨BREAKING: historic scenes at #COP30 as Colombia launches the Belém Declaration on fossil fuels, together with a first international conference on a just transition away from fossil fuels - and invites cities and subnationals.
November 21, 2025 at 1:18 PM
🚨BREAKING: historic scenes at #COP30 as Colombia launches the Belém Declaration on fossil fuels, together with a first international conference on a just transition away from fossil fuels - and invites cities and subnationals.
‼️ #COP30 could miss a historic opportunity if it does not formally include cities and subnationals in its outcome text.
Caterina Sarfatti, Head of the C40 Cities delegation at #COP30:
“This will not be the COP of implementation without highlighting the implementers."
Caterina Sarfatti, Head of the C40 Cities delegation at #COP30:
“This will not be the COP of implementation without highlighting the implementers."
Líderes do C40 propõem participação subnacional na carta final da COP30
Líderes do C40 propõem participação subnacional na carta final da COP30
www.cnnbrasil.com.br
November 21, 2025 at 12:36 PM
Reposted by C40 Cities
While @cop30brazil.bsky.social has been framed as a 'COP of implementation', @c40cities.bsky.social has argued that this will only be possible if #cities and other sub-nationals are recognised as critical partners in planning and delivery. 🏢
sustainabilityonline.net?p=16943
sustainabilityonline.net?p=16943
Cities need to be recognised as critical partners in climate action, says C40 - Sustainability Online
While COP30 has been framed as a 'COP of implementation', C40 has argued that this will only be possible if cities and other sub-nationals are recognised.
sustainabilityonline.net
November 20, 2025 at 12:57 PM
While @cop30brazil.bsky.social has been framed as a 'COP of implementation', @c40cities.bsky.social has argued that this will only be possible if #cities and other sub-nationals are recognised as critical partners in planning and delivery. 🏢
sustainabilityonline.net?p=16943
sustainabilityonline.net?p=16943
🚨BREAKING: C40 Cities reacts to the disappointing draft outcome of #COP30
@mark--watts.bsky.social, C40 Cities Executive Director, on the draft of the Belém Political Package:
“The draft texts we've seen this morning in Belém suggest several parties are trying to leave the global mutirão in ashes.
@mark--watts.bsky.social, C40 Cities Executive Director, on the draft of the Belém Political Package:
“The draft texts we've seen this morning in Belém suggest several parties are trying to leave the global mutirão in ashes.
November 21, 2025 at 12:21 PM
🚨BREAKING: C40 Cities reacts to the disappointing draft outcome of #COP30
@mark--watts.bsky.social, C40 Cities Executive Director, on the draft of the Belém Political Package:
“The draft texts we've seen this morning in Belém suggest several parties are trying to leave the global mutirão in ashes.
@mark--watts.bsky.social, C40 Cities Executive Director, on the draft of the Belém Political Package:
“The draft texts we've seen this morning in Belém suggest several parties are trying to leave the global mutirão in ashes.
The Yearly Offer of Action shows cities worldwide acting now — closing the gap between pledges and progress.
Cities are calling on national governments to work closer with them to go further and faster in tackling the climate crisis.
https://www.c40.org/news/yearly-offer-of-action/
Cities are calling on national governments to work closer with them to go further and faster in tackling the climate crisis.
https://www.c40.org/news/yearly-offer-of-action/
November 21, 2025 at 8:46 AM
The Yearly Offer of Action shows cities worldwide acting now — closing the gap between pledges and progress.
Cities are calling on national governments to work closer with them to go further and faster in tackling the climate crisis.
https://www.c40.org/news/yearly-offer-of-action/
Cities are calling on national governments to work closer with them to go further and faster in tackling the climate crisis.
https://www.c40.org/news/yearly-offer-of-action/
At #COP30 youth are urging to put cities & local solutions at the heart of climate action.
Global Youth is urging national govts to endorse & implement CHAMP to strengthen cooperation between national & local governments to ensure this becomes the COP of Implementation.
@mayors4climate.bsky.social
Global Youth is urging national govts to endorse & implement CHAMP to strengthen cooperation between national & local governments to ensure this becomes the COP of Implementation.
@mayors4climate.bsky.social
November 20, 2025 at 4:47 PM
At #COP30 youth are urging to put cities & local solutions at the heart of climate action.
Global Youth is urging national govts to endorse & implement CHAMP to strengthen cooperation between national & local governments to ensure this becomes the COP of Implementation.
@mayors4climate.bsky.social
Global Youth is urging national govts to endorse & implement CHAMP to strengthen cooperation between national & local governments to ensure this becomes the COP of Implementation.
@mayors4climate.bsky.social
🏙️ CITIES ARE DELIVERING.
A new @mayors4climate.bsky.social – @c40cities.bsky.social assessment released at #COP30 shows that local climate action is accelerating faster in CHAMP countries - those that partner with cities.
A new @mayors4climate.bsky.social – @c40cities.bsky.social assessment released at #COP30 shows that local climate action is accelerating faster in CHAMP countries - those that partner with cities.
November 20, 2025 at 1:51 PM
🏙️ CITIES ARE DELIVERING.
A new @mayors4climate.bsky.social – @c40cities.bsky.social assessment released at #COP30 shows that local climate action is accelerating faster in CHAMP countries - those that partner with cities.
A new @mayors4climate.bsky.social – @c40cities.bsky.social assessment released at #COP30 shows that local climate action is accelerating faster in CHAMP countries - those that partner with cities.
❗NEW: a call for cooperative climate action at #COP30
Mayors delivered a crucial message to President @lulaoficialbluesky.bsky.social: the need for a strengthened formal dialogue between national, local, and regional governments to accelerate the delivery of the Paris Agreement.
Mayors delivered a crucial message to President @lulaoficialbluesky.bsky.social: the need for a strengthened formal dialogue between national, local, and regional governments to accelerate the delivery of the Paris Agreement.
November 20, 2025 at 12:54 PM
❗NEW: a call for cooperative climate action at #COP30
Mayors delivered a crucial message to President @lulaoficialbluesky.bsky.social: the need for a strengthened formal dialogue between national, local, and regional governments to accelerate the delivery of the Paris Agreement.
Mayors delivered a crucial message to President @lulaoficialbluesky.bsky.social: the need for a strengthened formal dialogue between national, local, and regional governments to accelerate the delivery of the Paris Agreement.
🔴WATCH LIVE: local leaders conference at #COP30
Mayors and local leaders are the ‘climate doers’: this will not be a ‘COP of Implementation' without them.
📺 Live at 10am BRT/UTC-3:
unfccc.int/event/c40-ci...
Mayors and local leaders are the ‘climate doers’: this will not be a ‘COP of Implementation' without them.
📺 Live at 10am BRT/UTC-3:
unfccc.int/event/c40-ci...
November 20, 2025 at 11:03 AM
🔴WATCH LIVE: local leaders conference at #COP30
Mayors and local leaders are the ‘climate doers’: this will not be a ‘COP of Implementation' without them.
📺 Live at 10am BRT/UTC-3:
unfccc.int/event/c40-ci...
Mayors and local leaders are the ‘climate doers’: this will not be a ‘COP of Implementation' without them.
📺 Live at 10am BRT/UTC-3:
unfccc.int/event/c40-ci...