"Climate law is at an inflection point"

When is climate law just? The University of Bern's Hans Sigrist Symposium 2025 revolved around this seemingly simple question - and hit a nerve: over 100 people gathered in the large lecture hall of the UniS for the traditional annual event. Thanks to prominent court cases such as Klimaseniorinnen vs. Switzerland, law has gained momentum as an instrument of climate protection in recent years. In their keynote speeches at the Symposium, renowned researchers from the fields of climate physics, environmental sciences, law and political science demonstrated that the answer to the question above is actually complex and multi faceted. 

Audience at the Hans Sigrist Symposium 2025
Over 100 people gathered in the large lecture hall of the UniS for this year's Hans Sigrist Symposium.

One woman in particular helped shaping today's climate law: Christina Voigt, the winner of this year's Hans Sigrist Prize. The German-Norwegian professor of law at the University of Oslo is a pioneer in her field. "Climate law is at an inflection point," Voigt said in her presentation at the Symposium. She referred to the growing number of legal cases in which courts base their rulings on international climate agreements such as the Paris Agreement. For example, the International Court of Justice (ICJ) recently clarified that climate protection measures are a legal obligation for states and not a political preference.

Despite such successes, Voigt warned against relying solely on the courts to protect the climate. She emphasized that the challenge posed by climate change requires the strength and wisdom of society as a whole to overcome it: "Even the law has its limits."

Hans Sigrist laureate Christina Voigt during her keynote
Hans Sigrist laureate Christina Voigt during her keynote on climate law.

The University's most prestigious award

The Hans Sigrist Symposium took place on 5 December 2025. Christina Voigt officially received the Hans Sigrist Prize one day later at the Dies academicus of the University of Bern. The prize is considered the most prestigious award at the University of Bern and is endowed with 100,000 francs. The Hans Sigrist Foundation awards it annually to outstanding researchers from various disciplines. In 2025, the prize was awarded in the field of climate law. The Chairman of this year's Hans Sigrist Prize Committee was OCCR Director Martin Grosjean.

Hans Sigrist laureate Christina Voigt with Virginia Richter, Rector of the University of Bern
Christina Voigt (on the picture with Virginia Richter, Rector of the University of Bern) received the Hans Sigrist Prize at the University's Dies academicus. © Manu Friederich