18 June 2026

Saturday June 20 marks Show Your Stripes Day. Scientists, knowledge institutions and organisations will raise awareness about human-driven climate change, its far-reaching impacts, and the actions we can take to build a sustainable future.

On this day, Leiden University will raise the flag with climate stripes. The climate stripes, also known as warming stripes, were created by Professor Ed Hawkins of the University of Reading. These bold, simple visuals powerfully depict the rise in global temperatures over the past 150+ years and serve as a striking reminder of the urgent need for climate action.

Work together towards a sustainable future

At Leiden University, we take our responsibility to address the climate crisis seriously. Through our education, research, and campus operations, we work together to contribute to a more sustainable society. Whether you’re a student, staff member, or researcher, there are many ways to get involved.

What can you do?

• Get involved in a sustainability initiative at the university.
• Share inspiring examples or projects from your work, research or studies.
• Take part in activities and events related to sustainability.
• Contribute ideas on how to make teaching, research or operational management more sustainable.

Join Leiden University’s Sustainability Community

Here’s how you can take part:

• Leiden University Green Office (LUGO) is the central hub in Leiden and The Hague where students and staff collaborate to make the university more sustainable.
• Leiden University Sustainability Network: this platform connects students and staff who wants to combine their efforts and support each other in promoting sustainability across the university.