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.
How protecting migratory species built bridges between governments during COP15 in Brazil
The discussions showed how financing, peer learning, and cooperation across regions can help protect migratory species in the habitats and corridors they depend on.
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.
Ten ICLEI resources that readers downloaded in 2025
Every year, ICLEI works with local and regional governments, partners, leaders and other experts to develop and publish state-of-the-art, context-specific…
Circular Development Equitable Development ICLEI organization ICLEI's Five Pathways Japan Office Nature-based Development Resilient Development Zero emission Development
ICLEI Members in Japan are scaling action through ICLEI’s five pathways
In fiscal year 2024, ICLEI Members in Japan engaged in various activities connected to ICLEI’s five pathways toward sustainable urban…