On their website, re:arc institute uses the combination of two typefaces, Romie by Margot Lévêque and Ambiant Sans by Laura Csocsán. The logo uses Ambiant Sans with slight modifications.
From the About page:
Working at the intersection of climate action and architecture philanthropy, we fund community-led solutions that address the root causes and consequences of climate breakdown. […]
re:arc institute is a non-profit philanthropic association based in Copenhagen DK. Our work is made possible with funding from the Interogo Foundation.
We provide resources to an annual cohort working in diverse approaches that support architectures of planetary well-being.
The same fonts are also used for the Revision(s) website, an initiative of re:arc institute. The Revisions logo appears to be custom drawn, or from an unidentified typeface with similarities to Serous or Metaballs.