Modern childhood is increasingly segregated from nature. Yet, children’s nature experiences are first steps for sustainable futures. In this thesis, I research the foundations of habitats that can connect children to nature. I call them nature-connecting habitats. Five papers in this thesis answer: (RQ1) what is children’s human-nature connection (HNC)?; and (RQ2) what are the requirements of nature-connecting habitats for children? The preschools paper shows that five-year-olds with nature-rich routines have higher HNC than children with nature-poor routines, but it cannot understand which nature experiences are most influential. Hence, the salamanders paper assesses children’s participation in a nature conservation project. Discrepancies ...