25 Years of ICLEI
2015 marks our 25th anniversary. Watch the video to find out what we’ve achieved so far!
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Our most popular stories in 2025
To wrap up 2025, we look back at six stories that resonated most with our readers. From urban biodiversity and nature-based solutions to extreme heat, green finance and global sustainability agendas, these pieces capture a defining year for cities and regions.
Youth are taking climate stock. Here are ten ways cities can act with them.
To truly harness youth leadership, local and regional governments must go beyond consultation, co-creating processes where young people set agendas, influence decisions, and hold institutions accountable.
Working with youth across the world: Cities powering inclusive climate action
Recognizing youth as powerful drivers of change, local and regional governments are creating meaningful spaces for their voices, leadership, and ideas. This International Youth Day, discover how ICLEI Members are actively involving young people in shaping inclusive and impactful climate action.
From asphalt to wetland sponge park: How Chennai is absorbing water and building resilience
Once a parking lot and dumping ground, Chennai’s first wetland sponge park is leading the way for a climate-resilient city. Today, it functions as a natural water treatment system to manage stormwater and prevent floods, proving the power of nature-based solutions in shaping sustainable, thriving communities.
A global Plastics Treaty stalls, but cities can push ahead
As global Plastics Treaty negotiations failed to reach consensus, cities and regions cannot wait. Read four takeaways to guide local action against the plastic waste piling up daily in cities.
Can local climate dialogues really shape national climate action? The Town Hall COP Initiative is trying to prove they can
ICLEI’s Town Hall COP Initiative is emerging as a powerful model to make climate action truly locally led, transformation-oriented, and, most importantly, nationally relevant.